What are the advantages/disadvantages between a (possibly electric) velomobile and a regular bike when in daily use?

are more efficient than ordinary upright bicycles, and  are even more efficient. Then why do we see them so rarely on the road? Is it because they are expensive, or are there some non-financial, significant disadvantages?


i am writing thesis and need to have separate font (Calibri-like) for title page. How to change font family (for example, to "Allerta") for one page only?

The standard font packages make global changes to the fonts in my document. What if I want to use a particular font for just a portion of my text?   How do I find the right name of the font? How do I select the font? How do I restrict the scope of the font change?     There are separate answers for different flavors of TeX (quick links):


Let me start out by saying that I do my best to give every question due diligence in the Close Votes queue. However, every now and then, Stack Overflow likes to throw in a gotcha question to make sure that I'm not just blindly clicking through the edit queue trying to get a badge. I don't know if there is any kind of consequence for getting these wrong other than it displaying a demeaning message that pretty much says to the affect of "Hey idiot, you're not paying enough attention." Actually, I was giving all of my attention.  I ran into one gotcha just a few moments ago that was a real head scratcher when I got it "wrong". This isn't the first time I've honestly voted to close a question that I thought should be closed, only to find out that I was "wrong" for trying to close it.  I took a screenshot of it as I couldn't think of any better way to show what I'm talking about.    Here's what I noticed when reviewing this question:   The author says he is trying to follow some directions on an installation site, and he encountered an error after he entered some command. He says he's not sure. (very informative) He posts a log of his bash console, which includes some error messages. He provides absolutely zero dialogue about what he's tried to remedy the error. After reviewing the audit (thanks @rene for the link), I noticed he does list some vague, limited dialog in the comments. That brings for me up questions about whether comments should be included in the audit process.   Now, maybe I'm wrong here, but as an objective observer, this seems like a very low quality question. The author didn't provide much information about what he'd done prior to this. He offers little explanation about what he's tried to resolve the error. He didn't give much information about his system setup.  Was I truly wrong in voting to close this question? On one hand, the error message is right there on the screen. On the other hand, the author has left us with little information other than "here's my problem. fix it for me".  Some gotchas are just blatantly wrong. I come across them sometimes where words have just been substituted in random places that make no sense. However, ones like this seem too subjective. Looking at this question, I'd vote to close it every time because I feel that it's simply low quality.  What is the general consensus on this? Is there a penalty for getting these wrong?

Some people are complaining about the automatically generated audits. They are based on close reasons and apparently are a little controversial :-)          etc   I propose that for "good reviewers" (definition TBD) an extra UI component be added to let the reviewer suggest this as an audit item. Possibly:   Reject and add as audit button (Close and add as audit, etc) checkbox next to Reject, Close, etc checkbox on the Reject reason, Close reason etc dialog (could get messy, and some actions such as Reopen don't involve a subsequent dialog) dialog after rejecting, closing, Recommend Deletion, etc   Further, after passing or failing an audit, we could ask "good reviewers" "was this a good audit"? Bad audits, whether auto-generated or human suggested, could be removed from use if enough "good reviewers" identified them as such.  Now, what's a good reviewer? I don't want to judge only on behaviour in the review queue. I think flagging well is a good sign. So is editing - maybe an edit-related badge? And yes, some number of reviews would be good. Maybe some ratio of pass to fail on review audits. But not JUST what we do in the queues.  (I first suggested this in my answer to  but I'm bringing it up as a feature request of its own and to apply to all the queues.)


I don't know much about relativity, so I hope my question doesn't seem ridiculous.   From the equivalence of mass and energy we know that a moving object looks heavier from an observer's point of view. It means the object looks remarkably denser at high speeds. Relativistically, is it possible for an observer to see the object as a black hole (something from which even light can't escape)? Of course, this conclusion is paradoxical since there are observers that see it lighter and less dense. Where am I going wrong?

I'm a big fan of the podcast Astronomy Cast and a while back I was listening to a Q&A episode they did. A listener sent in a question that I found fascinating and have been wondering about ever since.   From the show :      Arunus Gidgowdusk from Lithuania asks: "If you took a one kilogram mass and accelerated it close to the speed of light would it form into a black hole? Would it stay a black hole if you then decreased the speed?"   Dr. Gay, an astrophysicist and one of the hosts, explained that she'd asked a number of her colleagues and that none of them could provide a satisfactory answer. I asked her more recently on Facebook if anyone had come forward with one and she said they had not.  So I thought maybe this would be a good place to ask.


What the title says when I try to start nautilus on terminal this is the output:  (nautilus:5593): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv-    >connections != NULL' failed  (nautilus:5593): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed Could not register the application: Timeout was reached  (nautilus:5593): Gtk-CRITICAL **: gtk_icon_theme_get_for_screen: assertion 'GDK_IS_SCREEN (screen)' failed  (nautilus:5593): GLib-GObject-WARNING **: invalid (NULL) pointer instance  (nautilus:5593): GLib-GObject-CRITICAL **: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed   PS: Krusader works fine though

When I launch nautilus from terminal the following error is printed and nautilus doesn't open up.  (nautilus:25179): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed  (nautilus:25179): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed Could not register the application: Timeout was reached  (nautilus:25179): Gtk-CRITICAL **: gtk_icon_theme_get_for_screen: assertion 'GDK_IS_SCREEN (screen)' failed  (nautilus:25179): GLib-GObject-WARNING **: invalid (NULL) pointer instance  (nautilus:25179): GLib-GObject-CRITICAL **: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed   What could be the problem??


Is there a way I can get the clue for the Fiz recipe? I can't remember what the old man said and can't find it anywhere.   I would prefer the clue (maybe a screen shot of it) but if not I'll just take the recipe. I have all the stuff for it just can put it together.

I received the instructions from Edward on brewing Fiz, such as they were.  Unfortunately I can't remember the exact details of what he said, and now I'm stuck.  For example, I think he said to talk to someone about the albino bees?  But I don't remember who or where.  What did he tell me?


I am not able to obtain the value of:$$ \int_{0}^{\infty}\dfrac{\sin(nx)}{x}dx ,$$  By changing the order of integration of: $$\int_{0}^{\infty}\int_{0}^{\infty}e^{-xy}\sin(nx) dx dy.$$ And by using differentiation under the integral sign.    If you can suggest some other method then please tell me. Thanks for help in advance.

A famous exercise which one encounters while doing Complex Analysis (Residue theory) is to prove that the given integral: $$\int\limits_0^\infty \frac{\sin x} x \,\mathrm  dx = \frac \pi 2$$ Well, can anyone prove this without using Residue theory?  I actually thought of using the series representation of $\sin x$: $$\int\limits_0^\infty \frac{\sin x} x \, dx = \lim\limits_{n \to \infty} \int\limits_0^n \frac{1}{t} \left( t - \frac{t^3}{3!} + \frac{t^5}{5!} + \cdots \right) \,\mathrm  dt$$ but I don't see how $\pi$ comes here, since we need the answer to be equal to $\dfrac{\pi}{2}$.


Let f be continuous on $[0, +∞)$  and differentiable on $(0, +∞)$. If $f(0) = 0$ and $|f'(x)| < |f(x)|$ for all $x > 0$, then $f(x) = 0$ for all $x ≥ 0.$  I tried using the Mean Value Theorem for this but can't get anywhere significant.

Let $f:\mathbb{R}\to\mathbb{R}$ be a function such that $f(0)=0$ for all real numbers $x$, $\left|f^\prime(x)\right|\leq\left|f(x)\right|$. Can $f$ be a function other than the constant zero function?   I coudn't find any other function satisfying the property. The bound on $f^\prime(x)$ may mean that $f(x)$ may not change too much but does it mean that $f$ is constant?  I thought for a while and found that $f^\prime(0)=0$ and by using mean value theorem, if $x\neq0$ then there's a real number $y$ between $0$ and $x$ such that $\left|f(x)\right|=\left|xf^\prime(y)\right|\leq\left|xf(y)\right|$. Anything further?


I am writing a small script to symbolically link configuration files from my dotfiles directory to another one. I do not have control over the file names and unfortunately one of them is causing me a lot of trouble. The simplest reproducible case I have is as follows: export file_name='My Configuration Text.theme'  readlink -f $file_name  Which predictably returns: /home/me/folder/My /home/me/folder/Configuration /home/me/folder/Text.theme  I need this to not be split. I have also tried readlink -f $(printf "%q " $file_name)  And it does not seem to fix the problem. Is there a solution to this or am I better off rewriting my linking script in something more robust like Python?

Or, an introductory guide to robust filename handling and other string passing in shell scripts.  I wrote a shell script which works well most of the time. But it chokes on some inputs (e.g. on some file names).  I encountered a problem such as the following:   I have a file name containing a space hello world, and it was treated as two separate files hello and world. I have an input line with two consecutive spaces and they shrank to one in the input. Leading and trailing whitespace disappears from input lines. Sometimes, when the input contains one of the characters \[*?, they are replaced by some text which is is actually the name of files. There is an apostrophe ' (or a double quote ") in the input and things got weird after that point. There is a backslash in the input (or: I am using Cygwin and some of my file names have Windows-style \ separators).   What is going on and how do I fix it?


Short version: I downloaded Ubuntu from my Windows PC, made a bootable usb stick and installed it on an Acer Aspire laptop (which had windows before). Now my WIFI does not work and I am completely lost as I need to download everything via Windows PC (But what do I need in this case? As I understand too little I would need to start with random solution like try another Ubuntu version, ...).  Some details after research on the web:  ethtool => not found ifconfig => not found lsb_core => not found iwlist scan lo       Interface does not support scanning enp1s0f1 Interface does not support scanning iwconfig lo       no wireless extension enp1s0f1 no wireless extension   I use a "normal installation" and "installed third-party software".  From lshw: Ethernet interface RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller Realtek Name enp1s0f1   As said: I am new to Ubuntu and more information can be shared if I know for what I must look... Any help is highly appreciated!  lspci -nnk | grep 0280 -A3 02:00.0 Network controller [0280]: Broadcom Limited BCM43142 802.11b/g/n [14e4:4365] (rev 01)         Subsystem: Foxconn International, Inc. BCM43142 802.11b/g/n [105b:07e]         Kernel modules: wl  lspci -knn | grep Net -A3; rfkill list 0: acer-wireless: Wireless LAN         Soft blocked: no         Hard blocked: no 1: acer-bluetooth: Bluetooth         Soft blocked: no         Hard blocked: no 2: hci0: Bluetooth         Soft blocked: no         Hard blocked: no   Work in progress:  sudo apt install bcmwl-kernel-source Paketlisten werden gelesen... Fertig Abhängigkeitsbaum wird aufgebaut.        Statusinformationen werden eingelesen.... Fertig bcmwl-kernel-source ist schon die neueste Version (6.30.223.271+bdcom-0ubuntu4). 0 aktualisiert, 0 neu installiert, 0 zu entfernen und 319 nicht aktualisiert.

This issue happens only on UEFI systems with enabled Secure Boot.  When I try to install DKMS modules like VirtualBox, Nvidia, or Broadcom drivers, they do not install and I get Required key not available when I try to modprobe them.  VirtualBox complains that vboxdrv is not loaded.  Broadcom wl driver is shown in lspci -k as a kernel module but is not in use. sudo modprobe wl throws Required key not available.  Also this issue may happen when I install some kernel modules from git sources.  This issue may appear after a kernel update as disabled wireless adapter, black screen after a reboot, etc.   How can I fix it?


I wrote an article in LaTeX using document class article and the natbib package, together with apacite. However, the publisher has so many requirements which are indiosyncratic that I think the easiest solution is just to write out the bibliography by hand and then remove the LaTeX produced bibliography pages using a PDF editor. I know this sounds quirky but I'm not sophisticated enough to keep modifying the apacite package. So, I copied and pasted it from the original REFERENCES list and then pasted it as plain text. Perfect, right? Nope. The trouble is, the second line of the text doesn't indent automatically and the first one does. In other words, I want to manually obtain outputs like this:  Is there a technique or tool to help me achieve this formatting, but without messing up my perfectly organized text-internal citations?

Just wondering, how would I reproduce this indentation formalism for certain scientific Journals:    Currently for the following LaTeX input  Draine, B. T., 2003, ARA\&A, 41, 241\\ Dufour, R. J. 1984, in IAU Symp. 108, Structure and Evolution of the Magellanic Clouds, ed. S. van den Bergh \& K. S. de Boer (Dordrecht: Reidel), 353\\ Fitzpatrick, E. L., 1986, AJ, 92 , 1068\\ Fitzpatrick, E. L., 1999, PASP, 111, 63\\   I am seeing this:    Would be nice to see a little indentation going on for the Dufour reference. Any pro tips would be warmly welcomed!


I have the following sentence and I need your help:  "For this case study(,) two residential areas are modelled in simulations."  Do I need the comma or not? I'd appreciate every comment.

I am no native speaker and always confused about the comma in introductory phrases, in particular in prepositional phrases. Is there any hard rule when a comma must be set? If I make a google search for certain phrases, I often find both variants. Typical examples where I am not sure whether a comma must be set are:        First[ly][,] I must phone mother   In this case[,] we must...   For simple problems[,] the algorithm...   From Lemma 1.2[,] we obtain...   For a typical user[,] the algorithm...   In our theory[,] we...   A dark line on the horizon[,] the mountain range we were headed for seemed somehow not as threatening as when we had started out on the trip.   Avidly reading her novel[,] Jane did not notice that her stop was approaching.   To be sure[,] it is not easy to see a solution.   When you get to Rome[,] give me a ring.


I have 1800 frames of animation to render for a school project thing, of which only 1/4 of it has animation. I have 7 more days and my computer just doesn't have the strength to do all of the 1800 frames in that time.  Can you skip frames that have no animation? Because that would really help me if there were only around 400 frames to render.  This is different than the other one because those answers weren't Windows compatible. Also, is there a way to only render 1 frame, then only a section on that frame onwards? I have what is technically a still image for ~800 frames, but only a small section is moving, is there a way to render the whole image, then only render and then use that image for 800 frames but only re render a small part of the 800 frames every frame... I didn't know how to word that right but I hope you get what I mean

I have an animation with lots of text objects flying about.  I'd like to render it with motion blur and stuff, but there are quite a few long sections where nothing is moving so that the text can be read. In these sections the render output (should) remain exactly the same.  Since it's pretty pointless to render the same image over and over, is there some way to automatically detect and skip those sections, only rendering one frame until there are more keyframes?


I was asked to prove why having a finite amount of site to cluster assignments eventually leads to convergence.  In the Lloyd version of K-means, we minimize the distortion measure at every iteration until convergence. Graphically, I understand this as having the centroids and sites more compact until no new cluster memberships are reassigned. I understand that K-means achieves local minima via an EM approach on cluster centroids. I fail to see how the amount of site to cluster assignments ensure convergence.   $r_{nk} = 1$ when the $n^{th}$ site is in the $k^{th}$ cluster,            0 otherwise.

For an assignment I've been asked to provide a proof that k-means converges in a finite number of steps.  This is what I've written:     In the following, $C$ is a collection of all the cluster centres.    Define an “energy” function   $$E(C)=\sum_{\mathbf{x}}\min_{i=1}^{k}\left\Vert  \mathbf{x}-\mathbf{c}_{i}\right\Vert ^{2}$$  The energy function is   nonnegative. We see that steps (2)   and (3)   of the algorithm both   reduce the energy. Since the energy is bounded from below and is   constantly being reduced it must converge to a local minimum.   Iteration can be stopped when $E(C)$   changes at a rate below a   certain threshold.   Step 2 refers to the step which labels each data point by its closest cluster centre, and step 3 is the step where the centres are updated by taking a mean.  This is not sufficient to prove convergence in a finite number of steps. The energy can keep getting smaller but it doesn't rule out the possibility that the centre points can jump about without changing the energy much. In other words there might be multiple energy minima and the algorithm can jump about between them, no?


Prove that $43^{101}+23^{101}$ is divisible by 66. I was able to find it to be divisible by 22 but not by 66. Please help

I read somewhere that     $(a^n - b^n)$         It is always divisible by $a-b$.   When $n$ is even it is also divisible by $a+b$.   When $n$ is odd it is not divisible by $a+b$.      and     $(a^n + b^n)$         It is never divisible by $a-b$.   When $n$ is odd it is divisible by $a+b$.   When $n$ is even it is not divisible by $a+b$.      I wonder what's the proof for this.  First postulate is clear. $(a-b)$ would or would not be a factor. Any light on others?


I am traveling to Paris via Ryanair from Copenhagen and there is a 9 hours layover in London, UK. I am planning to go out of the airport for 3 or 4 hours to visit the city during my layover. Do I need to have a transit visa or a general tourist visa, or can I simply go without a visa? I have a residence permit of Denmark. I am from Nepal.

Is there a website or some other way to find out if I need a transit visa for a short stop in the UK on my way somewhere else? Ideally this should give me the answer for all nationalities, and take into account any other visas I may have.


I notice that for the badge Strunk and White I need to have Edited 80 posts.  I can also see in my Activity that I've made 329 revisions.  I don't currently have the Strunk and White badge which got me wondering, What is the difference between the number of revisions I've made, and the number of posts I've edited?  Is it that my 329 revisions weren't accross 80 posts? (I haven't checked this to be sure but I will)

The descriptions for the editing badges are:     Editor:    Strunk & White:    Copy Editor:    Does "posts" include your own questions/answers, or are these badges just for edits to other people's stuff?  Other questions about how editor badge works:   What if I edit only a question's tags, but not its body? What if I edit both a question's tags and its body? Do edits to Community Wiki posts count? Do edits to answers count? Do edits to tag wiki pages count? Do edits to comments count? (Moderators can edit other users' comments, even outside of the usual five minute window.)


Following is an excerpt from , by Albert Einstein and Leonard Infeld:     Let us follow the motion of the idealized car on the idealized switchback as it begins to roll downward from the starting-point. As it moves its distance from the ground diminishes, but its speed increases. This sentence at first sight may remind us of one from a language lesson: "I have no pencil, but you have six oranges." It is not so stupid, however. There is no connection between my having no pencil and your having six oranges, but there is a very real correlation between the distance of the car from the ground and its speed. We can calculate the speed of the car at any moment if we know how high it happens to be above the ground, but we omit this point here because of its quantitative character which can best be expressed by mathematical formulae.   I wonder why have the author used "my" and "your"  in place of "me" and "you" in the sentence, "...There is no connection between my(me) having no pencil and your(you) having six oranges..."  I am confused, about when to use "me" and when to use "my". E.g in the following sentence should I use "me" or "my"?     I was in real, no King, of the forest in the past. I am asking the Tiger to imagine a scenario in which I be king of the forest in past. Since, the sentence is present perfect the fact of my being the king in the past has present consequences and I am for sure, not King of the forest at present in that imaginary scenario --- the consequence is the fear of me in the pythons. The Tiger thinks that the fear in the Pythons would be because of something else not because of my(me?) being the King in the past. I am asking him, wouldn't my being the King in the past enough to make a fear of me in pythons?   Please explain me in simple English, when to use me and when to use my, while referring to myself? How do the sentences appear to native English speaker, when we replace me with my? I do not know technical English grammar, like gerund, verb or noun things.

Which is the correct gerund clause that should be used here?    People killing animals is a bad thing.. or People's killing animals is a bad thing..  John being late is a bit inconvenient. or John's being late is a bit inconvenient.   (At the beginning of sentence,Is the subject before the gerund expressed as a possessive noun?)


I came up with an elementary counting problem for which I could find a simple solution. Please help. N people of different heights line up single-file, in how many ways there is exactly one person standing immediately behind someone who is taller?

Sloane's  counts the number of $n$-permutations with exactly one ascent.  For example $a(3)=4$ because we have: $1\wedge32$, $21\wedge3$, $2\wedge31$, $31\wedge2$ where I have marked the unique ascent with $\wedge$.  The same sequence also counts the number of length $n$ binary words that contain at least two $1$'s. For example $a(3)=4$ because we have: $011, 101, 110, 111.$  Is there a simple bijection between these two classes?  The formula for the sequence is $a(n) = 2^n - n - 1$.  I see how this counts the number of such binary words.  Is there a combinatorial derivation of this formula demonstrating that it counts the number of such n-permutations?  Both the exponential and ordinary generating functions of the sequence are given.  Again, I understand their symbolic derivation for enumeration of such binary words but can these functions be derived symbolically by considering the structure of such n-permutations?


I currently run a Twitter bot. I want it to publish an image every ten minutes. I'm currently accomplishing this by using time.sleep(600). This has led it to end up posting things at irregular intervals. However, I'm wanting it to publish an image every ten minutes like clockwork. At 1:00pm, at 1:10pm, at 1:20pm, at 1:30pm, etc. What is the best way to accomplish this?

I want to repeatedly execute a function in Python every 60 seconds forever (just like an  in Objective C). This code will run as a daemon and is effectively like calling the python script every minute using a cron, but without requiring that to be set up by the user.  In , the solution appears to effectively just  for x seconds. I don't need such advanced functionality so perhaps something like this would work  while True:     # Code executed here     time.sleep(60)   Are there any foreseeable problems with this code?


This isn't to change to the current rejection process or review queue in any way.      There was recently a  on one of my answers.  It was correct to reject from the reviewer's point of view, because variable names in code were changed, however, the edit would have been beneficial to the post in this case, and I would have liked the suggested edit to have been accepted.  I edited my answer and manually added the rejected suggested changes myself. On this occasion it was a small edit, but this would be quite time consuming if it was a more substantial edit.    It would be useful if we had a feature where a user can approve/improve an edit on their own question or answer which was previously rejected by community review.  Ideally, there would also be the option to Edit & Approve so we can change any bits if necessary.    Perhaps (for example) an option in the Suggested Edits history where only the OP, and maybe moderators, can select to approve or improve a rejected edit.   OPs can currently approve suggested edits, overruling the review queue, so this would just be an extension of that - being able to approve after 3 users have rejected.

A user  which added useful information to one of my answers. However, because it was a substantial edit, it was rejected by the reviewers. That's fine. However, as the owner of the post I would like to be able to overrule their decision after reviewing the edit myself (as I was encouraged to do by the notification in my inbox).  Currently, I had to open the edit suggestion in a different tab and manually copy and paste over the changes from the markdown diff to apply the changes. This seems laborious and doesn't give credit to the user who suggested the edit.  Request:  I would like a button on the suggested edit page, visible to the owner of the post, which applies the suggested changes, preferably just as if it had been accepted by the reviewers (i.e. giving credit to the editor and the +2 reputation for editing, if applicable).  Related discussions: (note that since this is a feature request, these are not duplicates)


I'm a beginner in commutative algebra, and I'm self-studying this subject via R.Y. Sharp's textbook.      Let $R$ be a commutative ring with $1$ which contains an infinite field as a subring. Let $I$ and $J_1,\ldots,J_n$ where $n\ge2 $, be ideals of $R$ such that:       $$I\subseteq J_1\cup J_2\cup\cdots\cup J_n.$$       Prove that $I \subseteq J_j$ for some $j$ with $1\le j \le n$.   It looks similar to the Prime Avoidance Theorem, but in this case each $J_i$ just to be ideals and I can't figure out what the role of "contains an infinite field as a subring" in this situation.   I expect for some idea / suggestion. Thank in advance.

Let $R$ be a ring and let $I_1,\dots,I_n,J\subseteq R$ be ideals such that $J\subseteq I_1\cup\dots\cup I_n$. Suppose that there exists an infinite field $K$ and a homomorphism $\phi:K\to R$. Prove that $\exists k$ s.t. $J\subseteq I_k$.   Attempt: (Edited)  If $J\subseteq I_1$ then we're done. Otherwise, let $x\in I_1$ and let $y\in J\setminus I_1$. $\forall r\in K, x+ry\notin I_1$ (because otherwise we'll get $y\in I_1$).  $K$ is infinite so we have infinitely many elements of the form $x+ry\in J$. So there's some $k$ for which $I_k$ contains infintely many elements of the former form.  If $n=2$ so $x+y\notin I_1$ implies $$x+y\in I_2\Rightarrow x\in I_1\Rightarrow I_1\subset I_2\Rightarrow J\subseteq I_2$$  Suppose the theorem holds for some $n$. $x+y\notin I_1\Rightarrow \exists k,I_k\ni x+ry$ for infintely many elements as above.


What's the meaning of this sentence below from Longman Dictionary of Contemporary English?     ▪ Blow me down if she didn’t just run off!     The Longman Dictionary says you use 'blow me' to show annoyance or surprise and is usually used in British English. But I still cannot figure out what it means and in what situation it can be used.

I would like to know what's the meaning of "be blowed" in the following text:     'I'm going to smoke' Jenkins said; 'be blowed to Bertie dear.' (Mrs. Smythe had once addressed her husband in the office as 'Bertie dear', and thereforth that had been his name among the staff.) Richard made no answer. When a minute later Jenkins, discreetly directing his puffs to the open window, asked him for the titles of one or two of Zola's novels in English, and their price, he gave the required information without turning round and in a preoccupied tone.   , Arnold Bennett, 1911.


On the paper by John Wheeler that first introduced the concept of , he states that when one tries to construct such geons with spherical symmetry, incoherence of the different EM modes is essential since  If all [disturbances] had the same frequency, they would add incoherently to form a single mode of electromagnetic field strenght. But there is no such thing as a nonzero source-free spherically symmetrical electromagnetic field disturbance.  Why is it that there cannot be a "a nonzero source-free spherically symmetrical electromagnetic field disturbance"? Where does this result comes from?

Why there is no monopole radiation in Electromagnetic field? I read somewhere that it is impossible because it violates charge conservation. I don't understand how? How charge conservation gets violated here?


In most fields I'm familiar with, first authorship is for the lead author. But I've heard that it wasn't the case in some fields. Is that true?

In my field (theoretical computer science), authors of any paper are always listed alphabetically; our papers .  (Well... hardly ever.)  In most other disciplines, at least within science and engineering, the ordering of authors is a signal about their relative contributions to the paper, with the first author indicating the most significant contributor.  Hiring and promotion committees do give extra weight to "first-author papers" (and sometimes have to be reminded that not all areas have them).  As an outsider, I find this practice confusing.  What does first authorship actually mean in your discipline? I understand vaguely that the first author is supposed to be the one who "", but what counts as "work" in this comparison?  Does "most" mean "more than all the other coauthors together" or just "more than any other coauthor"?  What happens when the comparison is unclear?   How often is "did the most work" the actual truth, versus a cover story for a more complex political decision?  I realize that the precise answer is different for every paper.  I'm looking for general guidelines for how an outsider (like me) should interpret first authorship in your field.  Pointers to guidelines from journals or professional societies would be especially helpful.  Please give only one answer per discipline.


Prove that if G is a group, g∈G is a fixed element and H = {a∈G | aga^-1=g}, then H≤G.   Trying to study for my final and I missed this question on the first test (just marked wrong with no feedback). I'm completely stuck on showing that H is closed. I have no issue showing that the identity is in H since that's trivial. I think I'm okay with the inverse too its really just closure that is stumping me.

Let $G$ be a group and let $a \in G$ be a fixed element. Let $$H= \{\text{$g \in G$ | $g^{-1}ag=a$}\}.$$  Prove that $H$ is a subgroup of $G$.    So I know I need to show:  (i) $H$ is closed under the operation on $G$.  (ii) $H$ is closed under inversion.  (iii) $H\neq \emptyset$    For closure:  Suppose $x,y \in H.$ Then $x^{-1}ax=a$ and $y^{-1}ay=a.$ So  $$\begin{align} (xy)^{-1}a(xy)& = y^{-1}x^{-1}axy \\  & = y^{-1}(x^{-1}ax)y \\  & = y^{-1}ay \\   & = a \\ \end{align}$$ Thus $xy \in H$.    Now how do I show it's closed under inversion? I'm not sure what the inverse is...   And to show $H \neq \emptyset$ all I need to do is show that the identity is in the set. And I'm not sure how to do that either.  Help!


WHat are the groups in which when installing Ubuntu 18.04 or 16.04, the installer is made a member by default. Is adm one such group? WHat about admin? What about sudo? If 18.04 has separate default groups for Server and Desktop installations, please specify.

Installed  by using install script and something crashed. Now I'm only member of my own group and lp.  Which are the default groups for users in for example Ubuntu 12.10? ?  Out of curiosity, is there some place where this information is logged? For example, some log file showing which groups my user was on previous boot? Is this information, (which groups are default), documented somewhere?


Last year, I came up with a solution to randomly display the names of my students in a presentation using the package tikz. Unfortunately, I'm not a LaTeX guru, and it's far from perfect:   Compilation is really slow (I've heard for loops should be forbidden...). The random generator doesn't seem to have a nice uniform distribution (at least for every seeds). I need to manually set a seed.   Actually, point 1. is what really matters for me.  How would you randomly display a word from a list of words previously defined?    Here the solution I'm using until now:  \documentclass[french]{beamer} \usepackage{babel} \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \usepackage{tikz}  \pgfmathdeclarerandomlist{classe}{{Adeline}{Apolline}{Alric}{Jana}{Alex}{Axel}{Baptiste}{Océanne}{Joris}{Lucas C.}{Esteban}{Margaux}{Emma F.}{Louis}{Nathan}{Grégoire}{Jérémy}{Emma L.}{Mélina}{Arthur}{Lea}{Laurette}{Flora}{Manon}{Julie}{Lucas T.}{Maëva}} \newcommand{\eleve}[1]{ \pgfmathsetseed{1} % seed I need to change \foreach \i in {0,...,#1}{\pgfmathrandomitem{\a}{classe}} \pgfmathrandomitem{\a}{cinquiemed} \a }  \begin{document} \begin{frame} \begin{enumerate}   \item<1-> $9 \times 7 = \action<3->{63}$ \hfill \action<2->{\eleve{0}}   \item<4-> $12 \times 12 = \action<6->{144}$ \hfill \action<5->{\eleve{1}}   \item<7-> $6 \times 7 = \action<9->{42}$ \hfill \action<8->{\eleve{2}}   \end{enumerate} \end{frame} \end{document}   And you can look at the last slide below to see the result:

How do I generate in LaTeX a list of random integers, in a given range, avoiding repetitions? The command \pgfmathrandomitem selects an item from a list, but when inserted in a loop can select twice the same item. Since I am selecting questions from a list in order to prepare an exam, I cannot ask twice the same question.


This morning I was trying to send a text to my friend but it didn't say delivered on the bottom of it. I then tried to call her and all it did was ring for a long time before going to voicemail. Does that mean her phone is off? Am I blocked? Or the connection just sucks? This is the first time this ever happened, so I'm just trying to make sure I shouldn't be worried.

I was texting my friend and everything was okay until I took a few minutes to reply to her message and my text suddenly does not say "Delivered" under it. I'm under Wi-Fi and she possibly was too so what could've happened? Was it me or her?


I have a Dell xps17 (windows 7) and I find the brightness control very annoying.   I often work during night time and the lower settings is fine but if I increase the brightness settings by just one step, the brightness is way to strong. I went in  Windows mobility center and it seems I can only increase the brightness by steps of 6. I have seen this  but it's very old (2011) and the guy didn't receive an answer except "it's impossible", which seems outdated because I have found this software  which seems to do what I want   But I wonder if there isn't a better solution (without having to download something), or a safer software (like an open-source one) to do this pretty simple (at least it's what it seems to me) job.   Thanks a lot!

I bought a Dell Inspiron (which runs Windows 7) and they seem to have done something to the brightness controls because it seems to be more coarse than I remember from my previous HP Pavilion (EDIT: yep. I can only change the brightness in jumps of 6). I wish to get a better control of the screen brightness to tune it to the specific sweet spot I'm interested in.   The model is N5110.  Is there a program or setting that can do this for me?


In the last couple of months, I was unable to connect to WiFi though Ubuntu 16.04; only connecting with the Ethernet cable worked.  Here is  if that's of any help.  I figured it must be because of drivers so I run apt-get update and got this error:  Hit:1 http://archive.ubuntu.com/ubuntu xenial InRelease Hit:2 http://ppa.launchpad.net/mjasnik/ppa/ubuntu xenial InRelease           Get:3 http://archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]       Hit:4 http://ppa.launchpad.net/nathan-renniewaldock/flux/ubuntu xenial InRelease Hit:5 http://ppa.launchpad.net/plushuang-tw/uget-stable/ubuntu xenial InRelease Get:6 http://archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]     Hit:7 http://archive.canonical.com/ubuntu xenial InRelease                     Hit:8 http://ppa.launchpad.net/qbittorrent-team/qbittorrent-stable/ubuntu xenial InRelease Get:9 http://archive.ubuntu.com/ubuntu xenial-security InRelease [107 kB]       Hit:10 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial InRelease Hit:11 http://ppa.launchpad.net/umang/indicator-stickynotes/ubuntu xenial InRelease Hit:12 http://ppa.launchpad.net/webupd8team/atom/ubuntu xenial InRelease Get:13 https://ftp.ussg.iu.edu/CRAN/bin/linux/ubuntu xenial/ InRelease [3.590 B] Ign:13 https://ftp.ussg.iu.edu/CRAN/bin/linux/ubuntu xenial/ InRelease Fetched 326 kB in 3s (98,8 kB/s) Reading package lists... Done W: GPG error: https://ftp.ussg.iu.edu/CRAN/bin/linux/ubuntu xenial/ InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51716619E084DAB9 W: The repository 'https://ftp.ussg.iu.edu/CRAN/bin/linux/ubuntu xenial/ InRelease' is not signed. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details.

I added some extra repositories with the Software Sources program. But when I reload the package database, I get an error like the following:     W: GPG error:  trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8BAF9A6F   I know I can fix it using apt-key in a terminal, according to the official Ubuntu documentation. But I would have liked to do it graphically. Is there a way to do this without using a terminal?


why doesn't this work?   I run this on two different computers!  I saved the file "Ref.bib" in the same ".tx" file directory   \documentclass{article} \usepackage[utf8]{inputenc} \usepackage[english]{babel}  \usepackage{biblatex} \addbibresource{Ref.bib}  \begin{document} Let's cite! The Einstein's journal paper \cite{faul2009statistical}  \printbibliography  \end{document}   Error messages:   I found no \citation commands---while reading file texstudio_So6416.aux  I found no \bibdata command---while reading file texstudio_So6416.aux  I found no \bibstyle command---while reading file texstudio_So6416.aux

Running the minimal example  \documentclass{article} \usepackage{filecontents} \begin{filecontents*}{\jobname.bib} @ARTICLE{example,   author  = {Other, Anthony Norman},   title   = {Some things I did},   year    = {2014},   journal = {J.~Irrep. Res.},   volume  = {1},   number  = {1},   pages   = {1-10} } \end{filecontents*} \usepackage[backend=biber]{biblatex} \addbibresource{\jobname.bib} \begin{document} Hello\cite{example}. \printbibliography \end{document}   I get the warning There were undefined references.  I have read  and know that I need to run:   LaTeX Biber LaTeX   However, my editor is only set up to run BibTeX. How do I go about setting up my editor/IDE to be able to run Biber, and how do I run the LaTeX/Biber/LaTeX cycle?  Answers (sorted alphabetically by editor name)                    Answer guidelines   Each answer should be for one editor. If the editor is cross-platform, if possible give a single answer with notes covering the minor platform variations. Please edit the question to include new answers in the 'link list' Each answer should be 'stand alone', i.e. don't say 'It's almost the same as editor Y but ...' for the editor part Instructions for 'build tools' such as arara or latexmk are welcome but should explain how to set up the editor in question as not all editors allow simple addition of arbitrary tools


In a passage of my book, a character tells another that he's "dead". Now, this scene is quite intense, propping up what seems like an imminent fight. The character being threatened has picked up on this, and asks a question in return regarding the information given, with an assumption added. My question is where the  comma should come.   Here are the two alternatives (as I see it):     But tell me Gussy, how do you intend to support this claim of my, I assume, imminent death?   Or number two:      But tell me Gussy, how do you intend to support this claim of my, I assume imminent, death?   The first alternative feels much more natural, especially considering how I'd say it. But the second one feels like it makes more sense. I feel it makes more sense because his assumption is the imminence, and not the "death" part. Though, this is quite obvious, considering the "death" part has already been explicitly stated. The imminence on the other hand, is strongly implied. Yet, the first alternative still feels syntactically wrong (if it even relates to syntax). But the first one is also the one that feels the most natural to write. Also, separating the sole adjective of a noun with a comma seems weird.   So, which alternative is correct? If both, which is most common and/or grammatical (if grammaticality is even a factor in such a case)?   EDIT: If I have understood the comments correctly, people are telling me that an alternative could be:      But tell me Gussy, how do you intend to support this claim of my (I assume, imminent) death   That alternative might be a misunderstanding of what the commenters were trying to communicate, but I guess that'll be revealed soon enough.

What is the correct rule for placement of a pair of parenthetical commas in a sentence? Let me explain the problem with the following example sentence wherein any person would find the people placing the parenthetical commas at two different places:   The CSI, in its email, has informed us that ...  The CSI has, in its email, informed  us that ...    Now, the question is: which of the two is correct? Or, better? Are they equally good? Can I write the sentence either way? I have googled the problem, but to no avail. Can anybody shed some light?


How is possible that executing this query (I replaced the fields with the used numbers) gives 0.80 on the device and 0.81 on the simulator?  "SELECT 1.15 - round((1.15*30.000000/100),2)"  I really can't figure out. Same code, same databases. Seems that the device round 0.805 to 0.80 and the simulator (correctly) to 0.81.

Consider the following code:   0.1 + 0.2 == 0.3  ->  false   0.1 + 0.2         ->  0.30000000000000004   Why do these inaccuracies happen?


I need to draw oblique shapes in Ai CC, when I use Rectangle tool, then Transform it, edges become pixelated. And those become unclear after saving it as image. Can anyone prompt better way to draw shapes? :(   Want to achive the result something like this shape   my shape is this    in PIXEL PREVIEW mode it's like this

Possible Duplicate:          I want to get a solution for a question that has been in my mind for a long time.  For the past 2 years, several times I was assigned to do some job involving low resolution images. Such as icon making, favicon making etc. These files have very low resolution like 16*16 px, 32*32px or maybe upto 100px.   I used Photoshop and Illustrator for creating such graphics. It looks fine and perfect in high resolution, but when I try to decrease the size to required low resoution, the images have noticeable defects in clarity. I was surprised to see low resolution images in other websites with better clarity and wondering, How is that possible? Hope stack will solve my problem.


I am in love with the bash shell look and feel show in the intro video of heroku. Anyone has got an idea how I can implement this kind of bash look :

What terminal is this and from where do I get such a beautiful terminal on Ubuntu?


Please how to write this series $$\sum_{n=1}^{\infty} \left(1+\frac{1}{2}+\ldots+\frac{1}{n}\right) z^n,\ z\in\Bbb C$$ into a product of power series? Thank you

How to compute the sum of the following series. I have no idea...  The series is $$\sum_{n=1}^\infty(1+1/2+\cdots+1/n)x^n.$$


"So, the reason that we're having less cases now is because of the lockdown measures that we have implemented" [https://www.youtube.com/watch?v=libhd7y8us0] [4:50] Normally I would say definitely "fewer cases" because "case" is a countable noun. But I googled it and it seems that "less cases" is commonly used. Are there any other similar "abnormalities" or shall we say "exceptions"?

I've just received a memo which says (effectively)      As more people leave, there will be less people available.   I want that word to be fewer. Are there guidelines for which word ought to be used when?


Why is a string with a minus sign not recognised properly when passed to a function in python? The simple code def f(s):     print(s)     if s is 'a-b':         print('I expect this to be printed.')     else:         print('Instead, this is printed.')   s = 'a-b' if s is 'a-b':     print('Oustide everything is fine.') f(s)  gives the output Oustide everything is fine. a-b Instead, this is printed.  Can someone explain please why this happens? Without the minus sign everything is fine.

My  has failed me.  In Python, are the following two tests for equality equivalent?  n = 5 # Test one. if n == 5:     print 'Yay!'  # Test two. if n is 5:     print 'Yay!'   Does this hold true for objects where you would be comparing instances (a list say)?  Okay, so this kind of answers my question:  L = [] L.append(1) if L == [1]:     print 'Yay!' # Holds true, but...  if L is [1]:     print 'Yay!' # Doesn't.   So == tests value where is tests to see if they are the same object?


I'm working in this exercise:  Find $$\lim_{n \to \infty} \frac{1}{n+1}+\frac{1}{n+2}+\cdots +\frac{1}{2n}.$$   I'm thinking about partitions and seeing this like an integral but I don't know which limits of integration should I use, maybe $0$ to $1$ since it's kinda close.  Any help is appreciated.

My foreign school book is not clearest at this point, what is really needed with this? What does it mean that "assign definite integral for $\lim_{n\rightarrow \infty}\sum_{k=1}^{n} \frac{1}{n+k}$"? I am not sure, whether I should assign it like this $\lim_{n\rightarrow \infty} \int_{1}^{n} \frac{1}{n+x} dx$ and noticing that it is continuous then trying to find borders so that $F(a) - F(b)$?  (the book messes up all kind of Leibniz stuff at this point, a bit messy -- and just stating $\int f(x)\,dx= F(a)-F(b)$, but not even paying attention to different borders. As far as I know, it is important to specify whether borders depend on the integration factor)


I am wondering why there is no infinitive before the word plan in the sentences below.  Thanks for helping me plan this out.  Is it the same rule with the words make and let? Or, it is about other rules? Let me know it, please. Thanks in advance.

What is the correct way to use infinitive after the verb "help": with or without "to"?  For example:     Please, help me to understand this.   or:     Please, help me understand this.


This is the code:      int a[3]={3,5,'s'};     printf("%d%c",a[1],a[2]);   I compile it with gcc like this      gcc test.c -o test   and it is working without a problem, output:      5s   I thought I should get an error because I have a character in an integer array. What is happening here?

In C++, sizeof('a') == sizeof(char) == 1. This makes intuitive sense, since 'a' is a character literal, and sizeof(char) == 1 as defined by the standard.  In C however, sizeof('a') == sizeof(int). That is, it appears that C character literals are actually integers. Does anyone know why? I can find plenty of mentions of this C quirk but no explanation for why it exists.


I know how to do the problem conceptually, and proving the equality by computing isn't hard, but we are required to use a bijection to prove this, any ideas please?

A known identity of binomial coefficients is that $$ \sum_i\binom{m}{i}\binom{n}{j-i}=\binom{m+n}{j}. $$ Is there a combinatorial proof/explanation of why it holds? Thanks.


I am struggling with Clamav, no matter what I do I get an error    Reading package lists... Done Building dependency tree        Reading state information... Done Package clamav is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'clamav' has no installation candidate   I tried   sudo apt-get -f install sudo apt-get update sudo apt-get upgrade   then   sudo apt-get install clamav   then   sudo apt-get install clamav clamtk   than from the Software Center, but no luck.  Can someone please help me to install ClamAV?

There are now errors when updating and I cannot install most software due to a corrupted  /etc/apt/sources.list   file. Is there a copy I can download to replace it?  The file would be for Ubuntu 12.04 (Final Beta) in the United States.


I try to write footnote in my file as  \footnote{http://chasen.org/\~taku/software/yamcha/}   But the tilde is compiled as /âˆ¼ in my web browser. So it can not reach the webpage.  I tried using package URL as following, but the same problem occurs.  \footnote{\url{http://chasen.org/\~taku/software/yamcha/}}   Any suggestion ?

I'm trying to make a URL with a tilde character (~) in it:  \usepackage{url} ... \url{http://lyle.smu.edu/~tspell/jaws}   It looks right in the resulting PDF, but when clicking on it the browser goes to a wrong URL: http://lyle.smu.edu/%18tspell/jaws  If I type in the browser %7e (escape code for '~') instead of %18 the browser then goes to the correct URL.  Any idea how to get a correct link in the PDF?


$result = Sippy::searcAccountCDRs($data,$request,$start_date,$end_date);          if(count($result['cdrs'])==1000)         {             $datas=end($result['cdrs']);             $start_date=$datas['connect_time'];             $i=1;             $final_result[]=$result['cdrs'];              while ($i<1000)             {                 $qresult = Sippy::searcAccountCDRs($data,$request,$start_date,$end_date);                 if(count($qresult['cdrs'])==1000)                 {                     $final_result=array_merge($final_result,$qresult['cdrs']);                     $datas=end($qresult['cdrs']);                     $start_date=$datas['connect_time'];                     $i=1;                 }                 else                 {                     $final_result=array_merge($final_result,$qresult['cdrs']);                     $i=1000;                 }             }         }          dd($final_result);   i got this error  Allowed memory size of 134217728 bytes exhausted (tried to allocate 3092400 bytes)

I have a bunch of client point of sale (POS) systems that periodically send new sales data to one centralized database, which stores the data into one big database for report generation.  The client POS is based on PHPPOS, and I have implemented a module that uses the standard XML-RPC library to send sales data to the service. The server system is built on CodeIgniter, and uses the XML-RPC and XML-RPCS libraries for the webservice component. Whenever I send a lot of sales data (as little as 50 rows from the sales table, and individual rows from sales_items pertaining to each item within the sale) I get the following error:  Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 54 bytes)   128M is the default value in php.ini, but I assume that is a huge number to break. In fact, I have even tried setting this value to 1024M, and all it does is take a longer time to error out.  As for steps I've taken, I've tried disabling all processing on the server-side, and have rigged it to return a canned response regardless of the input. However, I believe the problem lies in the actual sending of the data. I've even tried disabling the maximum script execution time for PHP, and it still errors out.


Infants can only perceive in one dimension (closeness and farness). Young children can only perceive three dimensions (they can't plan or handle time). Teenagers and young adults can perceive 3+1 dimensions. However, this is all psychological and dependent on our personal growth, which means that someone could exist who perceives more dimensions than 3+1 and it wouldn't be a logical contradiction.  Is there any way to empirically test whether there are more dimensions? If there were 3+2 dimensions, then I could have a clock that is two-dimensional. Or I could have one clock that would tick in one dimension and another clock tick in another dimension.  How can we design an experiment to test this?

Is there any scientific experiment that can lead us to conclude we live in 3 spatial dimensions without the premise of the conception of limited dimensions?  Thank you all who helped in the improvement of this question (which was not clear at first).   EDIT:  I know that this can be a little philosophical, but it is also a scientific question.  Let's consider the scenario where the mankind was not ever able to see.  Let's also consider that this limitation could be surpassed thus not limiting us to reach a scientific and technological knowledge "similar" to what we have today.  Would this civilization of blind people reach the conclusion that they are living in a 3D spatial world?  Is the sense of touch enough to reach that conclusion? Is there any scientific experiment that can lead us to that conclusion without the premise of the conception of limited dimensions?  Would it be easier, harder, or just different to reach a conclusion predicted by the M-Theory? (please do not focus only on this last question)


I've simply said that adding $1$ to the numerator and denominator when the denominator is $5^n$ (greater than $2^n$), the "$+1$" accounts for a larger portion of the numerator than the denominator, so $\frac{2^n+1}{5^n+1}$ better be greater than$\frac{2^n}{5^n}$ for all $n\gt0$. I'm just not satisfied with this explanation because it seems sloppy and not rigorous... Does someone have a better proof?

Given a fraction:  $$\frac{a}{b}$$  I now add a number $n$ to both numerator and denominator in the following fashion:  $$\frac{a+n}{b+n}$$  The basic property is that the second fraction is suppose to closer to $1$ than the first one. My question is how can we prove that?  What I have tried:  I know $\frac{n}{n} = 1$ so now adding numbers $a$ and $b$ to it would actually "move it away" from $1$. But I cannot understand why $\frac{a}{b}$ is actually farther away from $1$ than $\frac{a+n}{b+n}$.  Why is that? What does it mean to add a number to both the numerator and denominator?


Is it possible to define a command \MyCommand which does not swallow the next space (standard) but inserts a real space after itself only if the next symbol followed by it is a real space-symbol or CR? The command is supposed to have no arguments.

I have a definition:  \newcommand{\arnold}{Arnold Schwarzenegger}   When I refer to it by:  \arnold is a   it is rendered as:   Arnold Schwarzeneggeris a    In order to have a space in front of "is" I would need to write  \arnold\ is a   Is there some other shorter way?


What's the method of making the "ing form" of different verbs, in some verbs we double the last letter of that verb e.g: sit becomes sitting, dig becomes digging, and in some verbs we do not need to double the last letter of that verb e.g: go becomes going, read becomes reading. How should we know in which verb we double the last letter?

My son is learning how to spell. He is doing a good job listening to sounds and working out spelling that way (which doesn't work for many words, but at least a lot of common ones), but although he's gotten the -ing chunk, he frequently misses doubling letters in these words.  Is there a guideline for when the end consonant is doubled? He's working on these sorts of words:        riding   sitting   skating   writing   getting


The previous review stats had more options which you could complete on a post than the new review beta seems to provide: flagging, voting, and commenting. While I'm not sure if any of these three will be present in the other review tasks yet to be created, I'm curious as to what you're planning to do with the stats that users have built up in the old system when you decide it's time to switch to the new one.  Will the stats somehow be combined, or are stats going to be completely reset? Resetting them won't hurt anyone who hasn't really reviewed anything yet or already has the Reviewer badge, but those who have been working towards it and might be close, that might be a bit of a stab in the heart. I personally enjoyed reviewing just because it was something to do; my goal was to get my numbers as high as possible. Simple right? But this leaves me in a bit of a grey zone. Do I continue reviewing like normal? Should I focus on one thing over another? I get that the premise behind it is helping the community, but it's a bit demotivating not knowing what will happen with the stats I'm building in the future.  As well, with all the changes going on with what you can actually do in the review panel, will the badge be changing as well? There are a lot fewer actions you can complete, and we're not exactly sure how the new system even tracks things. Presumably any action other than "Not Sure" would count as an "action" on the post, and every one you at least click a button for will increment your "reviewed" count. Is this intentional to encourage more of a "clean-up" behavior through reviewing rather than just letting people vote on things as actions, or will the badge be modified to compensate for the limitations of the new tasks?  In case you're interested:

For your continued efforts in reviewing posts, even though the system sometimes messes up and doesn't let you actually review things and keeps displaying them over and over and over. So also, for your patience in putting up with the glitches in the review panel too! Haha  Anyways, a gold reviewer badge: 20000 reviews, over 4000 actioned  I just multiplied both numbers by 20. Think those numbers seem challenging? Is anyone up near those numbers or should it be multiplied by 10 instead? I prefer the higher amount because it would be gold and something harder to work for. :) But we also have to consider the longevity of when all these posts are eventually reviewed and it's only new posts being created.  Anyways, my stats for those who are interested (I wouldn't get the badge to start because I only have ~2000 actioned):  Upvoted            189 Downvoted          11 Edited             926 Commented          127 Voted to Close     44 Flagged            447 Reviewed           21609   As far as the name of the badge, I really like "The Owl is Watching" but not sure if that would be too long. Sounds snazzy though. Ideas?    Personally, I was on a quest to try and clear out all the posts in a single tab before it started showing me the same things over and over (and over) and then it got frustrating because I wasn't even making progress. Quest denied. :(    Lately I've noticed a massive build-up of unreviewed posts. When the review panel was first implemented, there would only ever be maybe 50 unreviewed posts at a time (in a given tab) for my monthly view. Now I log in and there's a thousand or two thousand pending. I think a lot of people quit reviewing after the first badge, so having a gold badge with a high threshold would really improve activity in the review panel and keep people going to improve the community.


I know you can save the output of executing a script/file to another file by using:  ./script.sh >> script_output.log   but this doesn't display the output in terminal during execution. Is there any way to also save the contents of execution in a file and display the messages in the terminal, during the script's execution?  Thank you in advance

So I echo output of my programs ran in terminal by command 2>&1 >> /path/toFile.txt  It creates few limitations that I want to overcome:   It "freezes" and gives no output in terminal - only way to see actual output is to open output file Opening output file is not giving live results. It gives results from time of opening that file     How to echo output to a file and be able to:  a) see live changes in that file (separate program would be needed I assume)  or  b) output to file and see that output in terminal in the same time


Suppose that $$f\colon (a,\infty) \to \mathbb{R}$$ is differentiable, and that $$\lim_{x\to\infty} f'(x) =0. $$ Show that $$\lim_{x\to\infty} \frac{f(x)}{x} = 0.$$ This can be done easily with L'Hôpital's rule, but it appears as a textbook exercise, in a chapter discussing Rolle's theorem, Mean Value Theorem, etc., before L'Hôpital's rule is introduced.

I'm trying to solve this question:     Let $f:[0,+\infty) \to \mathbb{R}$ be derivable and $\lim_{x \to +\infty} f'(x) = L$, then $\lim_{x\to \infty}\frac {f(x)}{x}=L$.   I'm trying to solve this question using l'Hôpital rule, but I couldn't use it, because I don't know if $\lim_{x\to +\infty} f(x)=+\infty$.  I need help.  Thanks a lot.


The first book on my list has actually been recommended to me like   multiple times over the years of me doing BookTube.   I found that sentence in my English book, and the last part where it reads  of me doing BookTube confuses me terribly. Shouldn't the object of a preposition be a noun or pronoun, not a verb? How can verbs be nouns?  The book translated the phrase into "while/when I am doing Booktube" and so I understand what it seems to be intended to mean here.  Could it perhaps be that there are some words omitted from the full sentence that if I knew what these unwritten words were, I would then be able to understand its syntactic structure more clearly? Did it skip writing the words "when/while I am" there? Why would the subject "I" turn into "me"? Is that still the verb's subject or did changing it that way now make it the verb's object? Why would all those words go missing? It is very confusing.  If this is actually a valid type of  English syntax used by native speakers that nobody ever taught me, could you please give me some similar examples so that I can understand its exact meaning and grammatical structure?  Why aren't we taught this syntax if it is actually used in real English?

I have a problem analysing this sentence from the point of finite/nonfinite clauses, clause elements and their functions:     He does not want to destroy his parents' dream of him achieving a Cambridge degree.   I am especially interested in the: dream of him achieving a Cambridge degree.  I know that 'achieving a Cambridge degree' is a non-finite -ing participle clause. However what is its function? And what is the function of 'of him'? Is it a postmodification?


I have a question , why decibels are useful for electrical engineers ?? I still can't figure out why it is useful to use decibels in expressing power ratios , gain and other things ?

I understand what a decibel is, the spirit of the question is different: why do we still use decibels (and with at least two different, context-specific definitions), if we have the feat of scientific notation? I dare to claim that the change of 5e-1 (which is a half) is much more readable than 3dB (voltage? power?). 1e6 is more clear than 120dB, etc. Just for the joy of adding? 3dB + 7dB is 10dB, but 2e5+3e6 is errrm... I see many new datasheets from the top vendors (LTC, for example) use the V/V convention, which is closer to the scientific notation than to the decibels. An upcoming paradigm change?


I'm having trouble aligning an image with text.  I want my image on the left, and the text inline on the right, centered vertically to the image.
                        555-1212
   Right now, the text hugs the top of the container.  How can I center it vertically to the middle of the container?

Why won't vertical-align: middle work?  And yet, vertical-align: top does work.   span{   vertical-align: middle; }
      Doesn't work.


We know that if continuous functions sequence $g_n(x)$ converges uniformly to $g(x)$, then $g(x)$ is continuous function.  But what if uniformly continuous functions sequence $f_n(x)$ converges uniformly to $f(x)$? Does that imply $f(x)$ is uniformly continuous function?   If so - how do we prove it? what $\delta$ should we take for $f(x)$? We can't simply choose $\min\{ \delta_n \}$.  And what if $f_n(x)$ converges pointwise to $f(x)$. Will $f(x)$ be continuous? uniformly continuous? Or pointwise convergence is not enough?

Here is the question:  Let $X$ and $Y$ be metric spaces.Suppose a sequence of uniformly continuous maps $f_n : X \rightarrow Y$ converges uniformly to a map $f: X \rightarrow Y$.Does that imply that f is continuous ? Uniformly continuous ($X$ is not necessarily compact)?  I proved (hopefully right) that $f:X \rightarrow Y$ is continuous , even without using uniform continuity of $f_n$ but just assuming $f_n$ are continuous.  I can't prove or disprove that $f$ is uniformly continuous  and whether adding the compactness condition would change the answer.


When I talk about something,I will tell people not to do something and why,so,should I use  Why should not we do sth.   or  Why we should not do sht.   Which one is grammatically correct?

(1) Does he not know? (2) Doesn't he know?  I don't usually see and hear questions formed in the first style. I was even surprised to know that it is grammatically correct. And actually it is the most "proper" way to form an interrogative sentence.  shows that the first style was much more popular before than now. What are your suggestions on choosing between these styles? And I will probably add the third one.  (3) He does not know?  EDIT: The answers have explained how to form a question, but have not actually provided an account on the usage of the first two forms. Especially I'm interested in the first form: does it sound formal, is it used in speech or only in writing, et cetera.


I have  code like belowe :  set         {             iDate = (DateTime.Parse(value).ToPersianDateString());         }   ToPersianDateString is a Extension method to convert 2016 to 1395 e.x.  this code work very well but in windows 10, below code , retrun an exception   DateTime.Parse(value)   my value is : Aug 31 2016 12:00AM   Exception message is : String was not recognized as a valid DateTime. why it return error ?  I think problem is Aug .

I have a datetime coming back from an XML file in the format:     20080916 11:02   as in      yyyymm hh:ss   How can i get the datetime.parse function to pick up on this? Ie parse it without erroring? Cheers


I have a curiosity. I would like to know if it is more efficient this code  int a(0); for(int i=0;i!=10;++i){     a=0;     for(int j=0;j!=10;++j){         // perform some operations on a     } }    or this code  for(int i=0;i!=10;++i){     int a(0);     for(int j=0;j!=10;++j){         // perform some operations on a     } }    or it is exactly the some in term of performance. I understand that the answer may depend on the compiler and its inner optimization technique but I am curios to understand if there is any difference.  Thank you, Marco.

I have always wondered if, in general, declaring a throw-away variable before a loop, as opposed to repeatedly inside the loop, makes any (performance) difference?  A (quite pointless) example in Java:  a) declaration before loop:  double intermediateResult; for(int i=0; i < 1000; i++){     intermediateResult = i;     System.out.println(intermediateResult); }   b) declaration (repeatedly) inside loop:  for(int i=0; i < 1000; i++){     double intermediateResult = i;     System.out.println(intermediateResult); }   Which one is better, a or b?   I suspect that repeated variable declaration (example b) creates more overhead in theory, but that compilers are smart enough so that it doesn't matter. Example b has the advantage of being more compact and limiting the scope of the variable to where it is used. Still, I tend to code according example a.  Edit: I am especially interested in the Java case.


I want to visit my boyfriend in the UK for 8 days.  My visa was refused because I'm unemployed and I forgot to explain that my family supported me financially on a day-to-day basis in my country. I said that I will go back to my country to find a job.   I'm planning to reapply. Actually I have a online shop (selling makeup) on Instagram. I said I was unemployed because I don't know what documents are needed for entrepreneurs. My annual income isn’t really big but it's enough to support me  financially for my day-to-day needs, cause I live with my parents.   What should I do next? Do I need to say that I'm self-employed instead of unemployed, and tell about my online shop?   I read that if we own a business, we need to submit business registration. Based on the rules and regulations of the government in my country, a business with a profit of under Rp 200,000,000 (£100,000) does not require a Business registration. I don't have any assets either. I'm from Indonesia.  I'm so confused right now. Please help me.

Many of the UK visa refusals we see here share a common pattern and the prevailing reasons refer to V 4.2 (a) and (c).    I do understand that, while the applicants may describe very different individual circumstances, there's a consistent pattern and, broadly, fall into specific categories:    Credibility (lifestyle, lack of ties, visit history, lies & omissions) Funding (insufficient funds, provenance of funds, funds parking) Sponsorship (family, friends, employer)   Question: What most commonly triggers a UK visa refusal where V 4.2 (a) and (c) are given as the grounds?  Secondarily: Given that there is a clear pattern, to what extent are these refusals predictable? Does sponsorship make a difference? Is there a set of personal circumstances, however abstract, where a refusal is all but guaranteed? For example, why do those we see here on TSE who sought entry for the PLAB or British Army appear to be refused with a common theme? Is there a uniform shortcoming or is it just discrimination?   PLAB: What is about applications for a visa, for the purpose of sitting the Professional and Linguistic Assessments Board (PLAB) exam, that seem to invite refusals. After all, the test is given so that international medical graduates can show that they qualify to practise medicine in the UK. The first part, PLAB 1, can be taken in centres outside of the UK. However, PLAB 2 can be taken only in the UK. Why can't you can't get a visa just to sit the exam, promising that you'll leave immediately after?    British Army: Since Commonwealth citizens are eligible to apply online to join, even those who don't reside in the UK, why is it so difficult to get a visa just to attend an interview to see whether you are suitable? Even with an invitation from the Army, such visa applications seem to be unsuccessful. Isn't a career in the British Army a valid reason?     Lastly:  After such a refusal, what approaches would increase the chance of a successful application?


I have a script which is run at startup from rc.local, I don't redirect the output anywhere.  When I first wrote it, I ran it in a shell, it worked as I expected and continually poured characters out of stdout to the screen so I added path/to/myscript to rc.local and didn't think anything more of it.  Recently when I ran a php script at the command line via an SSH shell I noticed when there were connection issues (between my terminal and the SSH server) this meant that stdout from the point of view of the php script had no where to go and the script would get 'stuck' until the connection improved and stdout once again started to flow.  This made me wander if I should actually be directing the output of my startup script somewhere, at least to /dev/null if I'm not interested in the output.  But the main question is what are the consequences of not doing so? is there some buffer that will become 'clogged' and prevent the script from working or will the output just be ignored?

I have some commands to in my rc.local. I know that they are failing. How can I get log file with messages produced by executing rc.local? Where is it located?  I have checked the /var/log/boot.log. I know my messages are not there because I know already what is the reason of failure. But I still want to make sure from log file.  Note, I don't want to run script again, I could but I don't want. I would rather analyse wht happened during startup.  Thanks for any help.  Ubuntu 12.04 Desktop (if it matters)


I have a Ubuntu desktop which is accessed by many other users. Is there an option or a command to check all the packages/application that was installed by a particular user.   Thanks

Is there a command (or specific syntax for history command) that generates (to screen or file) a log of all the installs on a system (whether they were through apt-get/yum/pip/npm/...).  If possible, can it be sorted by the user who installed them so that it can be determined if they were installed Global or Local.  Thanks


I learned that space is always expanding. Even between sun and earth, it's just gravity is stronger.   Imagine space as graph paper and there is a square object that fills it.  Space expands, 1x1 cell becomes 2x.   The space expanded not the objects in it. The size of an object remains the same.   So if N amount of matter was present, it's still N.  Just that before it was occupying 1 cell now 1/2 cell.  Did the density of object increase? something changed definitely. If it wasn't density then what changed.

I have looked at other questions on this site (e.g. "why does space expansion affect matter") but can't find the answer I am looking for.  So here is my question: One often hears talk of space expanding when we talk about the speed of galaxies relative to ours. Why, if space is expanding, does matter not also expand? If a circle is drawn on balloon (2d plane), and the balloon expands, then the circle also expands. If matter is an object with 3 spatial dimensions, then when those 3 dimensions expand, so should the object.  If that was the case, we wouldn't see the universe as expanding at all, because we would be expanding (spatially) with it.  I have a few potential answers for this, which raise their own problems:   Fundamental particles are 'point sized' objects. They cannot expand because they do not have spatial dimension to begin with. The problem with this is that while the particles would not expand, the space between them would, leading to a point where the 3 non-gravity forces would no longer hold matter together due to distance Fundamental particles are curled up in additional dimensions a la string theory. These dimensions are not expanding. Same problems as 1, with the added problem of being a bit unsatisfying. The answer seems to be (from Marek in the previous question) that the gravitational force is so much weaker than the other forces that large (macro) objects move apart, but small (micro) objects stay together. However, this simple explanation seems to imply that expansion of space is a 'force' that can be overcome by a greater one. That doesn't sound right to me.


I do not have function key / fn for that :( .  Any ideas? Maybe there are settings or commands?    Other subjects were NOT helpful:   gpointing-device-settings (auto-disable setting gets unticked); kde-config-touchpad (can not be installed alone); no idea how to useudevd .

I can disable my touchpad but if I'm away from my bluetooth mouse or forget my wireless dongle for my backup mouse, I'm SOL.  Linux Mint had a nice setting that allowed the touchpad to be disabled when using a mouse.  I'm now on Ubuntu MATE 16.04 and do not have that setting.  How can I get that functionality?  The turn off touchpad while typing option is not enough to prevent light touches of my palm to FU something I'm working on.  I've read other similar questions on here and was unable to find an answer for this exact issue.


In several sources of information, I found contradicting ways, how confidence intervals (CI) are presented. Thus, I am confused and would like to find out which one is correct: either $CI_{95\%} = [14.7,19.9]$, or $CI_{95\%} = (14.7,19.9)$. I.e. are 14.7 and 19.9 included in the interval or excluded?  In my opinion, the right way is to write the answer, which is in square brackets: $CI_{95\%} = [0.7, 1.0]$. But is there a theoretical explanation?

I have a question about confidence intervals.     In general, are confidence intervals open or closed?


Companies like Alitalia and KLM show on their web sites hand luggage dimension limits as:     max 55 x 25 x 35 cm   (Equivalent in inches should be: 21.5 x 10 x 13.5 in.)  Would hand luggage measuring 55 x 20 x 40 cm still be accepted as valid?  The sum of all dimensions in both cases is 115 (cm), although the lengths are distributed slightly differently across dimensions.  Some hand luggages like  measure 55 x 20 x 40 cm (and are classified on the web site as hand luggage, good for cabin).

What's the maximum hand luggage volume you can take with you to match all (or important) airline regulations considering only international connections?  In case my question is not clear, I'm looking for the one biggest carry-on bag that is accepted by all (or important) airlines on international connections. Accepted dimensions tend to be somewhat different on different airlines, meaning that a specific bag might be allowed on one airline, but not on another.  So, my question is what is the biggest bag that meets all (or important) airline requirements?


I am using Windows 8.1 with Windows Explorer. The image cache ("thumbs.db") is created when I visit a folder containing video, photo, or other such files. I have a problem with this because I have multiple folders with large videos and photos that are constantly changing. Every time I open a folder containing these files I have to wait several seconds until the thumbnail cache is created.   One workaround would be to disable the thumbnail cache. But I like to see thumbnails so this is not a solution for me. Instead, I would like to call a batch or another program every x-seconds that creates the Windows thumbnails recursively. I could then open the folders without delay.  How can I accomplish this?

Is there some way to get explorer to generate thumbnails without actually having to navigate and scroll through every folder?  All I could get was a command prompt script that would load an explorer window for all subfolders, however only images that were visible would have thumbnails created.


I upgraded to windows 8 about a month ago, and quickly downloaded a certain app (jetpack joyride) and enjoyed it a bit, but my system sadly had an issue that could only be fixed with a rollback. This was to the point before installing that app. The icon stays in start, I can click uninstall (but it remains), and whenever I try to install it from the store, I get error 80073cf9. Does anyone know what the issue could be?  I did a search through the registry, found three keys (which I deleted) and this let me install it from the store, but when I tried to play it, it redirects me to the app on Windows Store.  I have also looked in C:\Program Files\MicrosoftApps, but there was no reference to the app.

On my Windows 8 desktop I keep getting error 0x80073cf9 when I try to install or update an app from the windows store.  In the installings apps pane it just says "This app wasn't installed -- view details" and when I select that it says "Something happened and this app couldn't be installed. Please try again. Error code: 0x80073cf9"  I am using the built-in windows firewall and antivirus. And my laptop is able to install updates when it is on the same network.  This is what winstore.log shows when I try to update the maps app:  2012-10-18 15:31:47.328, _Info_                WS   [00015160:00011628] *********************************************************************** 2012-10-18 15:31:47.328, _Info_                WS   [00015160:00011628] Process name: C:\Windows\system32\taskhost.exe 2012-10-18 15:31:47.328, _Info_                WS   [00015160:00011628] User name: Desktop\User 2012-10-18 15:31:47.328, _Info_                WS   [00015160:00011628] Computer name: desktop 2012-10-18 15:31:47.328, _Info_                WS   [00015160:00011628] Windows build: 9200.16424.amd64fre.win8_gdr.120926-1855 2012-10-18 15:31:47.328, _Info_                WS   [00015160:00011628] Client version: 615 2012-10-18 15:31:47.328, _Info_                WS   [00015160:00011428] CWSTileUpdateHandler::Worker: Broker is handling badge updates. 2012-10-18 15:31:47.554, _Info_                WS   [00002572:00008200] CProgressDispatcher::OnProgress: AppId = 97a2179c-38be-45a3-933e-0d2dbf14a142, PFN = Microsoft.BingMaps_8wekyb3d8bbwe, InstallPhase = 1, PhasePercent = 0, TotalPercent = 0 2012-10-18 15:31:47.558, _Warning_             WS   [00002572:00008200] CDownloadProgress::IDownloadCompletedCallback::Invoke: Download complete result 0x80073cf9 for Microsoft.BingMaps_8wekyb3d8bbwe 2012-10-18 15:31:47.559, _Error_               WS   [00002572:00008200] CActionItem::_DoDownload: Download failed for 97a2179c-38be-45a3-933e-0d2dbf14a142, hr=0x80073cf9 2012-10-18 15:31:47.560, _Info_                WS   [00002572:00008200] CActionItem::_DoDownload: Notifying progress handlers of download failure for 97a2179c-38be-45a3-933e-0d2dbf14a142, hr=0x80073cf9 2012-10-18 15:31:47.560, _Error_               WS   [00002572:00008200] CProgressDispatcher::OnError: PFN = Microsoft.BingMaps_8wekyb3d8bbwe, InstallPhase = 1, hrError = 0x80073cf9


I had an idea and was wondering if it works. I seem to have gotten away quite cheaply. The many multiplications on the right side made me consider the prime divisors:   $p\mid (ah,bk)\Rightarrow p\mid ah \land p\mid bk \Rightarrow \left(p\mid a\lor p\mid h\right)\land\left(p\mid b\lor p\mid k\right)\Rightarrow \left(p\mid a\land p\mid b\right)\lor\left(p\mid a\land p\mid k\right)\lor\left(p\mid h\land p\mid b\right)\lor\left(p\mid h\land p\mid k\right)$.   Which matches exactly the right side! I am almost tempted to replace the implications with equivalences, use the definition of the gcd and call it a day! What do you think?  Reference  Apostol, Introduction to Analytic Number Theory, exercise 1.24.

I'm working through Oystein Ore's Number Theory and its History.  On p. 109, I'm stuck on #2.  The question asks the reader to verify the following identity [Note: $(x,y)=\gcd(x,y)$]: $$(ab,cd)=(a,c)(b,d)\left(\frac{a}{(a,c)},\frac{d}{(b,d)}\right)\left(\frac{c}{(a,c)},\frac{b}{(b,d)}\right)$$  I've tried numerous numeric examples and not found an exception.  I've tried a messy proof, substituting sample factors and exponents, but it's not very cohesive, clear, or robust.  Clearly, if $a,b,c,d$ are all relatively prime, the answer is clear.  I don't know how to concisely prove this if that's not the case though. I've tried using the idea that $m(x,y)=(mx,my)$ to get rid of the denominators, but I still end up with some fractions.  I've tried to use the symmetry of the fractions to simplify things. I also looked at this link without significant progress:


I've just switched from Mint to try Ubuntu and had a lot of problems with installing it. I managed to launch Ubuntu in tty and change my grub adding   nomodeset    to the grub config file...  Now i'm having problems with my desktop animations (there are no animations), screen brightness (iam unable to adjust it) and Nvidia Control Panel (its empty window with no info)  --> . So, I don't know what to do...  System info:  Asus GL753VD Ubuntu 18.10 Intel® Core™ i7-7700HQ CPU @ 2.80GHz × 8  Graphics: llvmpipe (LLVM 7.0, 256 bits) Graphic Card: GP107M [GeForce GTX 1050 Ti Mobile] Im using Nvidia 415 Driver.  Thank you!  p.s. it is a little bit strange that Mint is based on Ubuntu and i had literally no problems with it (except its Gui)    lspci -k | grep -EA3 'VGA|3D|Display'  00:02.0 VGA compatible controller: Intel Corporation Device 591b (rev 04)     Subsystem: ASUSTeK Computer Inc. Device 1590     Kernel modules: i915 00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th Gen Core Processor Gaussian Mixture Model -- 01:00.0 3D controller: NVIDIA Corporation GP107M [GeForce GTX 1050 Ti Mobile] (rev a1)     Subsystem: ASUSTeK Computer Inc. GP107M [GeForce GTX 1050 Ti Mobile]     Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia 02:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)

Ubuntu 18.04 is too slow on my Asus r558ur with 8GB RAM, 8GB swap area, 2GB Nvidia GeForce 930mx. All the graphics elements seem to appear in a sliding motion with some lag  and even dragging windows seems to flicker slowly. On booting from Live USB everything works fine though. Installation is done in Legacy BIOS.  Output forlspci -k | grep -EA3 'VGA|3D|DISPLAY' command:  00:02.0 VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics 520] (rev 07)     Subsystem: ASUSTeK Computer Inc. Skylake GT2 [HD Graphics 520]     Kernel modules: i915 00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 08) -- 01:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 930MX] (rev a2)     Subsystem: ASUSTeK Computer Inc. GM108M [GeForce 930MX]     Kernel modules: nvidiafb, nouveau 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)   Content of /etc/default/grub:  GRUB_DEFAULT=0 GRUB_TIMEOUT_STYLE=hidden GRUB_TIMEOUT=10 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian` GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" GRUB_CMDLINE_LINUX="nomodeset"


Please suggest me good books for metric space.  I am reading $topology$ $in$ $metric$ $space$ by $s$ $kumaresan$. This is a good book also and I want to know some other good books for metric space.And which books contains $first$ $category$ $theorem$, $second$ $category$ $theoram$ and also contains $good$ $exercise$ also and if some $hints$ or $solutions$ are provides that will be good .

I'm currently studying Undergraduate level - III, and I have a course of Elementary Metric Spaces, basically for a starter level. Now, for better concepts, I need a good book. One of my friends in my class suggested the book of Topology by J. Munkres, but there is just a small part of it. Please suggest me some books completely dealing with metric spaces.   Thanks in advance !!


1) I want to go look for my wedding dress today.   2) I want to go to look for my wedding dress today.   Are these both acceptable ways to say this?  Also, could someone point out the parts of speech? According to my thoughts, in first sentence:     I ⇒ Subject   want to go ⇒ compound verb (intransitive)   look for my wedding dress today ⇒ adverb

When I spoke with a friend of mine, I had noticed she used sentences similar to "I need to go buy food."   Is it correct to say "to go buy," or should I say "to go to buy"?    I know that I could say "I need to buy food," but I think that in "I need to go buy food," who is speaking is putting in evidence s/he needs to go and that s/he cannot stay any longer, or that her/his time to stay is limited.


How can I enable permissions to edit Email Deliverability access level? Currently it is not editable and in system mode. I need to edit it and set it to "All Email so I can test Approval and workflow functionality. is it restricted to our organization?


I have connected two Google accounts to my Ubuntu 19.10 PC to access easily to the documents stored in Google Drive. Ubuntu has added the accounts to 'Files' shortcuts, which is how I "mount" GDrive:   But it also added two icons to the dock, which are completely useless, since I can use them only to mount the "drives" and still have to access them through the Files app. A left click on the icons does nothing and with right click I get a menu with four entries of which only the first two work:   How can I remove those useless icons from the dock?

I have updated to Ubuntu 19.10 from CLI and, after the update, I have found a new icon on the dock.    As you can see from the picture, it is an icon to mount and open the 'GDrive' cloud service. Anyway, the icon does nothing and it seems irremovable. Also, a right-click on the icon shows an 'Add to Favorites' option and it makes no sense because the icon is already stable on the dock.  How could I remove that icon from the dock?


Is there a way to make algorithmicx not display the ends of blocks? I've tried redefining the block's end as empty, but it still typesets an empty line instead of ignoring it completely.  \documentclass{article} \usepackage{algpseudocode} \algrenewtext{EndIf}{}  \begin{document} \begin{algorithmic}[1]   \If{1}     \State do this   \Else     \State do that   \EndIf \end{algorithmic} \end{document}

All,  I am using the following Algorithm template:      \usepackage{algorithmicx}     \usepackage[ruled]{algorithm}     \usepackage{algpseudocode}  \vspace{-0.2cm}% \alglanguage{pseudocode} \begin{algorithm}[h] \small \caption{Delete item from Hash Table (with mCBF and aCBF)} \label{Algorithm:delete_mCBF_aCBF} \begin{algorithmic}[1] \Procedure{$\mathbf{DeleteItem}$}{item $x$}     \LineComment{\emph{Quick check if $x$ is in mCBF}}     \For {$i = 1 \to k$}             \If {$mCBF.C_{f_i(x)\%N}$ == 0}                 \State \textbf{return}             \EndIf     \EndFor     \LineComment{\emph{Look up $x$ in $aCBF_1\cdot\cdot\cdot aCBF_k$}}     \For {$i = 1 \to k$}         \If {\textbf{CBF\_query}($aCBF_i$, $x$) == \textbf{TRUE}}             \State $j \gets C_{f_i(x)\%N}$             \For {item $y \in B_j$}                 \If {$y.key == x$}                     \Comment \emph{found}                     \State \emph{remove $y$ from hash table}                 \EndIf             \EndFor         \EndIf     \EndFor \EndProcedure \Statex \end{algorithmic}   \vspace{-0.4cm}% \end{algorithm}   And I get this:    However, there are too many lines of end if and end for. Is there any more compact Algorithm template that does not contain these lines?


I am using the raspberry pi to generate a PWM signal to feed the servo motor. The output voltage (Max) from a Rpi GPIO is 3.3V whereas I need it to be 5V for my specific application. So I am thinking of using a Voltage amplifier, I have two choices:    1)A non-inverting amplifier like this:  Where Gain Av=Rf+R1/R1    2)A Transistor voltage amplifier something Like this:     Questions:    1)what would be the best choice? 2)considering the PWM frequency to be somewhere from 20-200KHz, Which one of those will provide the better output response?  Thankyou.

Is there any IC that interfaces any 3.3V Input/Output to 5V Output/Input? I need it primarily for an Arduino Due but if there any bidirectional IC that works like that it would be great.  Some people advised me to use the SN74AHC125 and CD4050 ICs, but I don't understand how they work or how to interface with them.


Can anyone give the exact single word for the feeling/quality of doing good works for others without having any selfishness?

I am wondering if there is a positive, formal counterpart to the slang "No strings attached" to describe, for example, a parent's unquestioned devotion to their children, or the virtue of someone's "a friend in need is a friend in deed", help first, question later mentality.


I want to itemize as [1] sentences [2] sentences....    But if I type   \begin{description} \itemsep -2pt % Reduce space between items \item[[1]] sentences \end{description}   in latex, it appears      [1 ] sentences    And if I type   \begin{description} \itemsep -2pt % Reduce space between items \item[$[1]$] sentences \end{description}   in latex, it gives me error.   How can I do it?

I want to make an enumerated list in the following format:  [1] foo foo [2] foo foo ...    How I can do that using enumerated lists? I have tried the following:  \begin{enumerate}[\left[ 1 \right]]   but it does not work.


My Requirement is when we click on edit button open child visualforce page as modal window when we save that record close that modal window and refrsh parent page.

I opened a Popup from an inline VF page in SFDC and then after some action I was able to close the window but needed a refresh of the Top window from inline frame .  My code is as below for opening a pop up.Note this is inline page   <apex:page standardController="Account" extensions="Accountctrl">  <apex:form >  <script>    function openwindow(){       window.open("/apex/pagereal", "myWindow", "width=200, height=100");    }  </script>  <apex:pageBlock >  <apex:pageBlockSection columns="1" id="Test" >     <apex:inputcheckbox value="{!test.istest__c}" label="Same as Above">     <apex:actionSupport event="onchange" rerender="Test" /> </apex:inputcheckbox>   <apex:outputPanel rendered="{!NOT(test.istest__c)}">  <apex:inputField value="{!test.Campaign__c}" /> <apex:inputField value="{!test.cust_vendor__c}" /> </apex:outputPanel> <apex:commandButton value="Tetete" onclick="openwindow();"/>   </apex:pageBlockSection>  </apex:form> </apex:page>   And my popup page code is as below and I want to redirect top frame from inline page  <apex:page >    <script>    function test(){      alert('hello');      window.opener.top.location.href='https://googleflowauth-dev- ed.my.salesforce.com/001900000096agv';   }     </script>    <apex:form >     <!-- End Default Content REMOVE THIS -->      <apex:commandButton onclick="test()" value="Test"/>     </apex:form>   The error is pretty much I know that it is for security browsers dont allow        Unsafe JavaScript attempt to initiate navigation for frame with URL '' from frame with URL ''. The frame attempting navigation is neither same-origin with the target, nor is it the target's parent or opener.   I am happy if i get workaround for same


I've been using my Mac for around 2 years, and 3 years overall with uni. I keep deleting files. When I do this, it comes up asking me to confirm my password that would normally come up after logging out and back in.  When I go to 'Trash', there is nothing inside the folder. Then, when I check my hard drive info, it just keeps going down in size, and not back up. Even deleting files over 1 GB in size. Makes no difference. Anyone got any ideas?

This happens not for all files. When I move or delete some of the files on my external drive Finder will ask for password. Is it due to permission set on these files ? Can I use something like Sudo when running Finder to prevent these pop ups ? The reason I'm asking is that sometimes I leave the mac running to move some files from one disk to another, just to find it on the password prompt a few hours later. Thank you.


Over the past week I have been noting that my cpu has been maxing out at 100%. Eventually I tracked that the freshclam deamon was consuming 75-80% of my cpu cycles. freshclam is associated to the anti-virus clamav software.  I removed clamav software but still the freshclam deamon restarts on reboot of machine.  I was able to stop deamon  /etc/init.d/clamav-daemon stop /etc/init.d/clamav-freshclam stop  and I tried to remove from startup  update-rc.d -f clamav-daemon remove update-rc.d -f clamav-freshclam remove  but alas does not work, freshclam is running on restart.   To quote the bard (slightly modified) "Will no one rid me of this troublesome deamon" Assistance would be appreciated.

I try to update the ClamAV database by running freshclam. The daily-*.cdiff is downloaded successfully, but then the process hangs. The CPU is maxed out at 100%, but the update just will not finish. I canceled the process with Ctrl+C after appr. 10 minutes. Here is the output from my update attempt:  # freshclam ClamAV update process started at Tue Nov  8 00:15:57 2016 main.cvd is up to date (version: 57, sigs: 4218790, f-level: 60, builder: amishhammer) Downloading daily-22474.cdiff [100%]   Did anyone else observe this behavior? Is it a bug or is my system not properly configured?  PS: I am using ClamAV v0.99.2 on Ubuntu Mate 16.04.


I missed semicolons in some of the places in my JavaScript, but its not throwing error in any of the browsers. Is the ; at the end needed?

In many situations, JavaScript parsers will insert semicolons for you if you leave them out. My question is, do you leave them out?  If you're unfamiliar with the rules, there's a description of semicolon insertion on the . Here's the key point:     If the first through the nth tokens of a JavaScript program form are grammatically valid but the first through the n+1st tokens are not and there is a line break between the nth tokens and the n+1st tokens, then the parser tries to parse the program again after inserting a virtual semicolon token between the nth and the n+1st tokens.   That description may be incomplete, because it doesn't explain @Dreas's example. Anybody have a link to the complete rules, or see why the example gets a semicolon? (I tried it in JScript.NET.)   is related, but only talks about a specific scenario.