Can we detect a gravitation field of an object after it failed into a black hole?  Take a simple non-rotating, non-charged black hole and throw a massive object into the black hole:  When the object is outside of the black hole, we can detect the gravitation field of the object.  After the object quickly crossed the event horizon, can we still detect the object's gravitation field?  If yes, does it mean that we (outside of the black hole) can detect how the object fails to the singularity?  If no, how it will look like? Will it be a wave on the event horizon like circular waves on the water? Can we deduce from this wave any information about the state of the object behind the horizon?

A thought experiment:   Take an object that is massive enough so we can detect it's position in space by measuring its gravitation field (for example, by sending almost tangential laser beams and measure how they deviate in the object's gravitation field).  Take a simple (non-rotating, non-charged) black hole. Send this object to the black hole. While the object falls into the black hole, measure the object's gravitation field (therefore, the object's position).   I'm wondering what will we see when the object:   Is getting closer to the event horizon. Crossing the event horizon. Fails to the singularity under the event horizon.   My intuition tells me following:   As time around the black hole slows down for an external observer, we may see that the object (i.e. its gravitation field) is always in the place it touched the black hole. (EDIT: According to "", this will not happen.) If my previous assumption is wrong, we may see how the object falls down to the singularity behind the event horizon. Also, the shape of the event horizon will deviate from an ideal sphere and by measuring these deviations we will see a position of the object under the horizon, which seems to contradict to the definition of the event horizon.   My questions are:   In any generally recognized theory that describes this situation? What will happen to the object and its gravitation field according to this theory (theories)? How confident we can be in the description given by this theory?


I guess this is probably the most stupid question asked on this community but I want to know about all the parts of a bike. I am a non-native English speaker and am finding it difficult to understand the question and answers here. Would you post a picture or some mnemonic device or anything you find valuable related to bike parts, so I could get the names of all the bike parts in my head permanently. Thank you.

This question and its answers list the names of bike parts and cycling concepts. Some Rules  Make sure you only put one term per answer! Try to include an image if applicable Include sources that contain detailed information Add a link to the index in this question using edit.  Also, I made this a community wiki, so that anyone will be able to edit it, and to stop rep-hoarding  There's a handy reference at the , a bike repair map; it's a diagram of a bike with all the parts labeled, and is very handy! At the moment, the diagram is up at . (They've changed the URL in the past, so this link may break.) A road bike has the following parts ():  A mountain bike has the following parts ():   Edit: This page is meant to identify what things or concepts are (as per ). If you want to recommend an accessory or a specific product you've found handy, please use the .      Contents                      e                    j                n    o                        u    v        x    y    z


I am authoring a document in IEEE transaction double column format. Inline Math equations are being rendered improperly, mostly there are unwanted spaces between symbols (as I have highlighted below). I understand that Latex has to adjust text spacing to justify the columns. Can there be any means to instruct Latex to split Math mode expressions as well to reduce redundant space insertion?  \documentclass{IEEEtran}[10pt] \usepackage{amsfonts}  \begin{document} A bilinear pairing defined to be $ \mathcal{G} = (p,\mathbb{G}_a,\mathbb{G}_b,\mathbb{G}_T,e,P_a,P_b)$ where we choose $\mathbb{G}_a=\langle P_a \rangle$ \end{document}

In the inline math mode ($...$), if the formula is too long, LaTeX will try to break it on operators, e.g.  very long text followed by a very long equation like $a+b+c+d+e+f+g+h+i+j+k+l$ etc   may be rendered as  very long text followed by a very long equation like a+b+c+d+e+f+g+h+i+ j+k+l etc   However, the break won't happen if they are separated by commas, e.g.  very long text followed by a very long equation like $a,b,c,d,e,f,g,h,i,j,k,l$ etc   will overflow the page like  very long text followed by a very long equation like a,b,c,d,e,f,g,h,i,j,k,l etc   How to make LaTeX able to insert line breaks after a comma too?


$f$ is a differentiable function such that $f(f(x)) = x$ for $x ∈ [0, 1]$. And $f(0) = 1$. What is the value of $\int_0^1{(x − f(x))^{2016}}dx$ ?  I have noticed that one solution of $f$ is $f(x) = 1-x$, then the integral can be easily evaluated. Can it be done without assuming $f(x) = 1-x$?

This question was asked in an entrance test for an undergraduate mathematics program today, held all over India.   Question: $f$ is a differentiable function in $[0,1]$ such that $f(f(x))=x$ and $f(0)=1$.  Find the value of $\int_{0}^{1} (x-f(x))^{2016} dx$.  I tried to solve it by substituting $f(f(x))$ in place of $x$, but could not proceed much further. Any hints or solutions will be appreciated.


While writing a new comment, if one uses the "@username" syntax to mention a previous commenter, the system confirms that it recognizes this username by showing a tooltip expansion of the "@username".  It would be nice if this expansion were performed for all such "@username" mentions -- including the name of the post-owner, previous editor, or moderator.  One might make the case that such a feature is not needed, since the help for  explicitly states that:     The owner of the post you're commenting on will always be notified of your comment   and that:     You can use the same method to notify any editor of the post, or – if this is the case – to the ♦ moderator who closed the question.   Nevertheless, I still think that this would be a nice feature.  Not everybody reads the official help.  And even after I did read the help, I still had lingering doubts after mentioning an editor in a comment, as to whether he was really notified or not.

@username auto-completion for comments was , and is already active on MSO.  However, it only seems to auto-complete the usernames of people who have commented on the post. According to , the list of users who can be explicitly notified also includes:   Anyone who edited the post Anyone who started a bounty on the question The ♦ moderator or  who cast a binding close vote on the question   Why not auto-complete those, as well?


My ~/Library folder has gotten very large. Inside this ~/Library folder is a folder name Caches. This folder 5.5 GB. Can this Caches folder be trashed.

Is it safe to delete the file Caches, in the Library of the Mac OS X Hard Drive?  It's a pretty big file, 3.56 GB, Caches reminds me of logs i don't need or browser cookies.   Is it safe to delete the folder "Caches"?


Suppose a series RLC circuit has its resonance frequency f_r. If we apply AC current of frequency f_r to this series RLC circuit then circuit has maximum current as output. My question is little bit hypothetical. What will be the output of the series RLC circuit if we apply AC current of mixed frequency where one of its frequency is f_r? For simplicity we can assume AC current made up of two frequencies, (say f_r and f_s) where f_r != f_s. PS: I am very sorry for any incovenience. Please comment if still there is ambiguity.


By default when you are grabbing part of a mesh you can move it around smoothly or you can press the Ctrl key to move it in steps.  Somehow I pressed something I wasn't supposed to and now it moves in steps normally and I have to keep Ctrl pressed to move selections around smoothly, how can I return to the default settings?

My cursor is moving by every selection by large increments!  Normally when I use Blender, I am able to select and move objects to any coordinate. Now, all of the sudden, when I select an object or mesh the selection moves by an inch or so in each direction.  How do I reset it to normal?


I don't know this question is suitable to be asked here or not..dont mind. I develop a website yesterday and wanted to publish it on the internet. I know GitHub is a right choice it is totally free for static pages but it won't allow you to upload more than 100 pages.so this didn't work. then I search a lot on the internet for a free hosting website but I did find one which works there are many free hosting websites but they such a mess make thing so complicated. I deactivated 7 accounts from all website. I waste my time and did publish my site.  so is there no any way to do so.?

This is a "catch-all" question designed to serve as an answer for all questions about choosing web hosting.  Pro Webmasters no longer accepts new questions about how to choose hosting.  All future questions pertaining to finding web hosting should be closed as a duplicate of this question. For more information about this policy please see .    How to find web hosting that meets my requirements?  What we're looking for in answers to this question are the basics about web hosting:   What is web hosting? What is the difference between shared, VPS, and dedicated hosting? How does a content delivery network relate to web hosting? Anything else you feel is helpful in finding a web host.   What we do not want is:   Endorsements or recommendations for specific web hosts We do not want your experience or other subjective information (just the facts please)


We all know that universal statements are always in present tense. For example,     My grandma did not believe that the Earth revolves around the Sun.   Here, though the sentence is in past tense, Earth revolves around the Sun remains in simple present tense.  But in case of a false belief that is contrary to a universal truth, does the above rule apply similarly? For example,     My grandma believed that the Sun revolves around the Earth.    Will this sentence be taken as grammatically correct? Shouldn't it be "My grandma believed that the Sun revolved around the Earth"?

I know the past tense carries the past tense in every dependent clause, but referring specifically to places or to things that are eternal, like the Earth, seems a bit weird and therefore we sometimes (I believe incorrectly) say     He didn't know that New Jersey was actually on the East Coast.   Because it still is. Or     He thought the Earth was round.   So is it square now?  Logically speaking, would you consider the use of past tense here a bit confusing in a day-to-day speech in these examples? Would you instinctively opt for using the present tense?


I want to create a persistent Ubuntu 20.04 on my 8GB USB stick. Currently I have both windows and ubuntu as base Os. Better with windows.

Persistent live drive with a partition for persistence There are some web sites describing  new tools new features in [new versions of] old tools  that can create a persistent live drive from an iso file with Ubuntu 19.10 and the corresponding Ubuntu family flavours.  Why and how does it work? How is it different from earlier methods for persistent live drives? Isn't live the default for a cloned drive?


Here's the original stackoverflow.com question:    and there's a website which copied my question & answer and posted it as someone else:    What the hell? Is it copyright legal and all? It's not me posting there lol and definitely it's not their "expert" answering that question...

of Stack Overflow, all content posted on Stack Exchange sites by their users (i.e. you wonderful people) has been provided to the whole universe under . For my fellow non-lawyers, that license basically means:   Anyone can use any Stack Exchange posts at any time without having to ask for permission Making money off of the copied content is permitted You don't even have to copy stuff from here verbatim; you can just use it as a starting point and make whatever edits you want There are just two rules you have to follow:   You have to provide . Simple links to the original post and author info are just fine. You have to  and allow other people to use your content, as long as they follow these very same rules. How meta!    (If you ever forget any of that, and want to refresh your memory, the license info is linked to in the footer of every page.)  There are, in fact, a lot of people who republish varying amounts of our content for assorted reasons. Unfortunately, there are some Stack Content Republishers Attributing Poorly and/or Excelling at Ranking (SCRAPERs, for short).  In this context, "attributing poorly" means any use that doesn't follow our attribution rules or make any other reasonable attempt at give credit. This can get pretty egregious; I've seen SCRAPERs that not only don't link back to SE originals, but also use fake author info and post dates to make it harder to find originals. By "excelling at ranking," I'm referring to copycat sites that end up higher in Google results than the original SE sites do for the same content. That's not necessarily wrong, but in some cases, it indicates inappropriate SEO hackery.  So, the question is: what can you do if you spot a SCRAPER?


Let $T_1,T_2$ be two linear transformations from $\Bbb R^n$ to $\Bbb R^n$.Let $\{x_1,x_2\ldots x_n\}$ be a basis of $\Bbb R^n$ .Suppose that $T_1x_i\neq 0\forall i=1,2,.....n$ and that $x_i\perp \ker T_2\forall i=1,2,.....n$.  Which of the following are true?   $T_1$ is invertible  $T_2$ is invertible $T_2,T_1$ is invertible Neither $T_1$ nor $T_2$ is invertible   For $T_1$:  Define $T_1:\Bbb R^2\to \Bbb R^2$ by $T_1(x_1)=x_1;T_1(x_2)=-x_1\implies T_1(x_1+x_2)=0\implies T _1$ is not one-one and hence not invertible.  For $T_2$:  Let $x\in \ker T_2\implies Tx=0$ where $x=\sum_{i=1}^n c_ix_i$  Now  $\langle x,x_i\rangle =0\forall i\implies c_i=0\forall i\implies x=0\implies \ker T_2=\{0\}$  **But I am unable to show that $T_2$ is surjective. Let $y\in \Bbb R^n\implies y=\sum c_ix_i$.But I don't know what steps to follow next.  Please give some hints.

Let $T_1,T_2$ be two linear transformations from $\mathbb{R}^n$ to $\mathbb{R}^m$. Let $\{x_1,\cdots , x_n\}$ be a basis of $\mathbb{R}^n$. Suppose that $T_1x_i \neq 0$ for every $i=1,2,\cdots, n$ and that $x_i \bot \ker T_2$ for every $i=1,2,\cdots, n$. Which of the following is/are necessarily true?   $T_1$ is invertible. $T_2$ is invertible.  both $T_1,T_2$ are invertible.  neither $T_1$ nor $T_2$ is invertible.   My Approch:  Given dimension of $\mathbb{R}=n$ and  $x_i\perp Ker(T_2)$  So, $\text{Ker}T_2=0$  Row space and null space are perpendicular to each other.  From Rank Nullity Theorem:  let T : V → W be a linear map. Then the rank of T is the dimension of the image of T and the nullity of T is the dimension of the kernel of T, so we have  $\text{dim}(\text{Im}(T))+ \text{dim}(\text{Ker}(T))=\text{dim}(V)$  Applying above result we get,  $\text{dim}(\text{Im}(T))+ 0=n$  Therefore, $T_2$ is one-one.  I could not solve this problem completely. what to do next?


Under mac and Windows, the updates can be done automatically. For certain people, this is great. In Linux Mint 17, I can't find an option to enable the updates automatically.   I know there is a trick, based on Ubuntu, with command line to enable the autoupdates, but the security levels of Mint in updates manager are not respected (i.e.: unattended-upgrades).   Please, could you tell us how to, or which way can, enable the updates automatically with respect of the security levels of the updates manager (levels 1,2,3,4,5)?

I have linux mint 17.1 xfce, and I am wondering how to automatically install updates. Every time a new update is available I have to click on the mintUpdate icon on the panel and enter my password and click install. I think it is supposed to be good to install manually so that you can judge whether or not you really want to install the update. But I have never in two years decided that I didn't want to install an update, so I think it would be easier to just have it done automatically in the background.  Now I found a  purporting to explain how to install updates automatically. But I don't think it does a good job of explaining which updates will get installed automatically if you follow their instructions. It gives a configuration file to use that looks like this  // Automatically upgrade packages from these (origin, archive) pairs   Unattended-Upgrade::Allowed-Origins {   "${distro_id} ${distro_codename}-security";   // "${distro_id} ${distro_codename}-updates";   // "${distro_id} ${distro_codename}-proposed";   // "${distro_id} ${distro_codename}-backports";   };    but it doesn't explain how these origins map onto mintUpdate's "levels".  My goal is to install all updates classified as level 1, 2, or 3 by  mintUpdate as well as all security updates. But I don't want to install non-security updates for level 4 or 5. How would I do this?


my question is....How to assign random numbers to the matrix of Buttons [5][5]. The numbers will be ranging from 1 to 25.please answer.please answer me.

How do I generate a random int value in a specific range? I have tried the following, but those do not work: Attempt 1: randomNum = minimum + (int)(Math.random() * maximum);  Bug: randomNum can be bigger than maximum. Attempt 2: Random rn = new Random(); int n = maximum - minimum + 1; int i = rn.nextInt() % n; randomNum =  minimum + i;  Bug: randomNum can be smaller than minimum.


How do I input a composite video signal from a Data video SE-500 into my MacBook Pro for OBS streaming?

I want to transfer my family's analog video tape collection to digital form on my Mac (mid-2014 MacBook Pro).  Unlike the asker in , my goal is not to identify an inexpensive solution but rather to preserve video and audio quality.  I would prefer to do it myself because besides being naturally hands-on I can't risk these being lost/damaged/not-returned if sent out.  Details  Details of my particular situation follow, but please feel free to provide answers, background, and further considerations useful to future readers with similar but possibly varying needs.   Our working     which has  through which I can still play... Our 20     which are 10 to 15 years old.   How can I best preserve the content of these tapes?   What device and/or software should I use to transfer and convert the videos into digital format? What target video file format should I choose to preserve quality and maximize flexibility?  Electronic-only files are fine with me -- I don't particularly need or want to burn to DVD or Blu-ray.


find the maximum value of $$xy + yz +zx$$given that $x+2y+z=4$  my attempt : $(x+y+z)^2=x^2+y^2+z^2+2(xy+yz+zx) $   or $2S=2(xy+zx+zy)=(x+y+z)^2 -x^2-y^2-z^2=(4-y)^2-x^2-y^2-z^2$  $2S=-x^2-z^2-8y+16=-x^2-z^2+4x+4z$  from the the above we can say due to symmetry maximum value occurs at $x=z$  hence $S=-x^2+4x$ whose maximum is 4  is this right or/and is there a better way ??

if $x+2y+z=4$ and $x,y,z$ are real number. then find maximum value of $xy+yz+zx$  putting $x+z=4-2z$ in $y(x+z)+zx = y(4-2z)+zx = 4y-2yz+zx$  i wan,t be able to  go further,could some help me with this


I need cinelerra for my video eediting in Ubuntu but i cant install that. Anybody can help me?

I have some problems installing cinelerra on my Ubuntu.  How do I install it?


Does anyone know how to open .lyr files in QGIS without having access to ArcGIS or to Arc2SLD?  Perhaps there is a plugin or open source program that could do it.

At college we use ArcGIS Desktop 10, but that does not function on my Mac so I have QGIS there instead.  I want to do my exercises with QGIS, but in ArcGIS Desktop we use .lyr files with ArcMap and .lyrx files with ArcGIS Pro, and they are not supported by QGIS.  Does anyone know, how I can connect the *.lyr files to my *.shp files to use them on my Mac with QGIS?


Ubuntu version numbers don't match the rest of the space, and it's not clear why they don't or how they actually work.   For instance, there's openSSL 1.0.1n and 1.0.1f-1ubuntu9.8  What's the reasoning for this? What does the ubuntu part of the version number mean? I'm not asking why 1.0.1n isn't available yet, I'm asking why the equivalent (in terms of security patches) has a name that cannot be compared.

Each package name is in the form: package-XubuntuY*_amd64(i386)  So my questions are:   What does the X stand for? What does the Y stand for?   for example binutils_2.22-6ubuntu1.3_amd64  What is the meaning of the numbers 6 and 1.3


How do I delete all files that start with 'labtest,' but keep the file 'labtest' itself undeleted?  I was trying  rm labtest*[!"labtest"]   But that didn't work out too well.    Question 5  Enter a command to delete all files that have filenames starting with 'labtest',  except 'labtest' itself, from the current directory (Delete all files starting with 'labtest' followed by one or more characters).  You entered: rm *labtest?![labtest] Please try again.

I have a directory containing a large number of files. I want to delete all files except for file.txt . How do I do this?  There are too many files to remove the unwanted ones individually and their names are too diverse to use * to remove them all except this one file.  Someone suggested using   rm !(file.txt)   But it doesn't work. It returns:  Badly placed ()'s    My OS is Scientific Linux 6.  Any ideas?


There is a D state process (stuck) which is not killed even by kill -9. I see PPID is systemd.  root       1863      1     0        **Ds**    /usr/sbin/smartd -n  root          1      0     0        **Ss**    /usr/lib/systemd/systemd --switched-root --system --deserialize 23   How can I kill the D state process without a node hard reboot?

An apache2 process got stuck on my server and caused problems with other services. (original problem: kerneloops after USB hardware disconnect)   root@server:~# ps aux | grep apache2 | grep -v grep www-data 12917  0.0  0.1 412148 16156 ?        D    Jun27   0:00 /usr/sbin/apache2 -k start   Naturally, I killd it. it's still alive. so I kill -9d it. It's still "alive".  Now this is where the question gets serverfault/unix&linux-worthy: Is there a way to get port 443 back without doing the obvious thing: rebooting? Iptables is installed.  Update: I could not resolve the Problem withouth rebooting. The general approach (use lsof or /proc/$PID/fd to find out which and get rid of that drive) as described here and in the "duplicate" could well have worked if not for additional (probably) hardware defects.


I would like to draw this diagram in tikz-cd. Specifically I would like the arrow to start 'from the top' of B here. I have looked at the example in the manual for tikz-cd, drawing the Snake Lemma, but it doesn't exactly explain anything well, and I have no idea what I'm doing regarding tikz in general. Is this easy at all to do? To anyone asking why I would want to draw this diagram: I don't. I want to draw a diagram using similar arrows

How does one draw the "snake" arrow for the connecting homomorphism when using the ?  I'd also be interested in drawing similar arrows act as "carriage returns" when considering a long exact sequence of cohomology.  I'm sorry if this is a little vague. I'm hoping that someone who's already done this might be willing to share a template. I'd prefer things in xy-pic, but would also be interested to see other ways it can be done.


Today I ran into a question on the "new questions page" about handling some VHDL code, after answering it, I decided to look at other, similar, questions and noticed a large propensity of them getting little to no traffic/answers/votes etc.  Many of these low traffic questions that I saw were good questions; where as, and maybe I'm stretching too far, but if the question was language agnostic or more high level or even in another language it would have higher visibility.  Now this is where I want to find out what the policy should be (or maybe already is), should there be some line in the sand that is drawn; where in, the questions should be moved to the electrical engineering site, where it is more likely to get a better response and more visibility within a community that more routinely uses these languages and paradigms that are attributed to hardware based programming.  I know, from my experience with lurking on both sites routinely, that I see faster responses with more visibility from the EE.SE site (with my responses routinely being "sniped" because someone has more experience than I on the topic and can get the same response I would give out faster and more eloquently) on these topics than on the main SO site.  My main concern with this is that if questions about things like VHDL and Verilog stay at this low end visibility on SO, and they're new to the SE family of sites, they probably won't know and won't get redirected correctly if there isn't a decent policy on this.  And as such will be discouraged from asking questions of that nature on here in the future.  Furthermore, with low visibility there's the likelihood that someone answering won't necessarily be incentivised to put in the effort to answer the questions either since there's no guarantee that their answer will reward them based on the quality, because again, I saw many quality answers to these same types of question with only a single vote, or maybe two, and little to no traffic.  I understand that these languages and the design therein isn't a mainstream language topic or process, and maybe that's where I'm getting hung up, but if that's the case they should be diverted to a community that already handles questions in this arena, and a migration of question from SO to EE.SE should be considered.  , the first comment shows a redirect towards EE.SE, but, the problem with this is, if he re-asks the question over there, it's duplicating information across multiple SE sites which is a no-no, so instead it sits, with a moderately good answer (accepted but only partially accurate in its statements) and a near zero likelihood of someone giving something better with a more thorough explanation, since there's really no incentive to do so (near no traffic == near no votes/publicity == near no impetus to make a "better" answer known).

I've been learning VHDL and as I get some questions in my head, I wonder where should I put them. So where should VHDL, Verilog and other HDL questions go? Or does it depend on the question?


Suppose $X$ and $Y$ are topological vector spaces, $dim(Y) < \infty$, $\Lambda : X \rightarrow Y$ is linear, and $\Lambda (X) = Y$. Prove that $\Lambda$ is an open mapping.  Thanks in advance.  Edit:  Definition of TVS: Here, a Topological Vector Space is a vector space such that vector addition and scalar multiplication are continuous and also singletons are closed.

Suppose $X$ and $Y$ are topological vector spaces, $\dim (Y)<\infty$, and $f:X\to Y$ is linear and surjective. Prove that $f$ is open and if the null space $N$ of $f$ is closed, then $f$ is also continuous.  The second assertion is easier since the quotient space $X/N$ has the universal mapping property.


I just Upgraded my kernels to 4.4.0.31.33 , and the new upgrade removes the old kernels so I ended up without 4.2.0-35 , the one previously used.  The problem is that grub does not see the new kernel image and everything that uses that looks for the old linux headers which are missing.  Even when I run sudo update-grub2 the old entries appear , but not the new ones:      Generating grub configuration file ...     Warning: Setting GRUB_TIMEOUT to a non-zero value when   GRUB_HIDDEN_TIMEOUT is set is no longer supported.     Found linux image: /boot/vmlinuz-4.2.0-35-generic     Found initrd image: /boot/initrd.img-4.2.0-35-generic     Found memtest86+ image: /boot/memtest86+.elf     Found memtest86+ image: /boot/memtest86+.bin     done

uname -a returns:    Linux decebal-mobile 4.2.0-35-generic #40-Ubuntu SMP Tue Mar 15 22:15:45 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux   but E: Package 'linux-headers-4.2.0-35-generic' has no installation candidate  and my machine says linux headers version is at linux-headers-4.4.0-21-generic.   I have seen a similar problem described in a .  How can I update that?


I am using texmaker on ubuntu 12.04.   After compiling the bibliography does not apper.  I am new to latex so maybe I am doing something of wrong.  I know that there are a lot of post with the same problem but I am not able to solve with them.  here a small example:  this is the file AWSPCA.tex      \documentclass[oneside]{article} \usepackage[cmex10]{amsmath} \usepackage{amssymb} %\usepackage{graphicx} %%\usepackage{amsthm} \usepackage{graphics} \usepackage{subfigure} %%\usepackage{float} \usepackage{epsfig} \usepackage{rotating} %%\usepackage{enumerate} \usepackage{booktabs} \usepackage{multirow} \usepackage{bm}  \usepackage{cite} \usepackage{color} %% correct bad hyphenation here %\hyphenation{op-tical net-works semi-conduc-tor}    \begin{document} Hello  \cite{shen2008sparse}   \bibliography{biblio}{} \bibliographystyle{plain} \end{document}   And here the file biblio.bib  %List of References  @article{shen2008sparse,   title={Sparse principal component analysis via regularized low rank matrix approximation},   author={Shen, Haipeng and Huang, Jianhua Z},   journal={Journal of multivariate analysis},   volume={99},   number={6},   pages={1015--1034},   year={2008},   publisher={Academic Press} }   The two files are in the same folder.  The obtained output is  Hello[?]  without the bibliography. I tried to compile the file different times.  From the compiler I receive this warning   LaTeX Warning: Citation `shen2008sparse' on page 1 undefined on input line 24. No file AWSPCA.bbl. [1 {/var/lib/texmf/fonts/map/pdftex/updmap/pdftex.map}] (./AWSPCA.aux) LaTeX Warning: There were undefined references.

I've browsed the forums and found a number of posts that have addressed this issue, but none of the solutions seem to work for me. I have the following script that I just copied from the bibtex home page to get familiar with it. Instead of the citation number I get a question mark. I compile using Latex+Bibtex+Latex+Latex+PDFLatex+ViewPDF just as has been previously suggested and the problem persists.   \documentclass[11pt]{article} \usepackage{cite}  \begin{document}  \title{My Article} \author{Nobody Jr.} \date{Today} \maketitle  Blablabla said Nobody ~\cite{Nobody06}.  \bibliography{mybib} \bibliographystyle{plain} \end{document}   My bibliography (Bib.bbl)  @misc{ Nobody06, author = "Nobody Jr", title = "My Article", year = "2006" }    Looking at previous posts one thing that is concerning is that my .bbl looks empty as shown below. Further, I don't have a .blg  \begin{thebibliography}{}  \end{thebibliography}


eli5: Is my Linux Mint machine Ubuntu? and what is the difference between ubuntu and say debian? and what other Linux OS's are there out there??   I just say the word Ubuntu and pretend to sound smart in front of my friends muahah!!

Just did a live usb of Linux Mint 11 (DVD edition) and couldn't find major differences bar unity in 11.04. Are there any major differences?


I am having a really hard time trying to understand how to determine my program's runtime, is there a easy way to do it? Also, when I try to search a specific element in an array, why the time complexity is O(1) instead of O(n)? (I think it is O(n) because in the worst case you have to go through the whole array to find out if the element exists)

I'd prefer as little formal definition as possible and simple mathematics.


I have a right triangle and the altitude from the vertex of its right angle drawn. A=(-4,0), B=(0,3), and C=(0,0) are the vertices of the triangle, and F=(-36/25,48/25) is the foot of the altitude on the hypotenuse AB. I use the following commands to draw a right-angle mark.  \coordinate (U) at ($(F)!3mm!45:(A)$); \draw ($(A)!(U)!(F)$) -- (U) -- ($(C)!(U)!(F)$);   Why doesn't it look like three sides of a square with edge length 3mm?  \documentclass{amsart} \usepackage{amsmath}  \usepackage{tikz} \usetikzlibrary{calc,intersections}   \begin{document}  \begin{tikzpicture}  \coordinate (circle_1) at (-8/5, 4/5); \draw[blue, fill=blue=25!] (circle_1) circle (4/5);  \coordinate (circle_1) at (-3/5, 9/5); \draw[orange, fill=orange=25!] (circle_1) circle (3/5);   \path (-4,0) coordinate (A) (0,3) coordinate (B) (0,0) coordinate (C); \coordinate (F) at (-36/25,48/25); \draw (A) -- (B) -- (C) -- cycle; \draw (F) -- (C);    %A right-angle mark is drawn at F. \coordinate (U) at ($(F)!3mm!45:(A)$); \draw ($(A)!(U)!(F)$) -- (U) -- ($(C)!(U)!(F)$);   %A right-angle mark is drawn at C. \coordinate (U) at ($(C)!3mm!-45:(A)$); \draw ($(A)!(U)!(C)$) -- (U) -- ($(B)!(U)!(C)$);   \end{tikzpicture}   \end{document}

I'm trying to draw an airplane.  When I was drawing the window for the cockpit, I was using projected points to get right angles.  But things aren't working out as expected.  Could anyone give me a pointer about what I'm doing incorrectly?  \documentclass{article} \usepackage{tikz} \usetikzlibrary{calc} \pagestyle{empty} \begin{document}  \def\aeBodyRadius{0.25cm} \def\aeBodyNoseDistance{0.21cm} \begin{tikzpicture}[x=5cm,y=5cm,scale=3,every node={transform shape}]    \coordinate (TAIL) at (0,0);   \coordinate (NOSE) at ($(TAIL)+(30:1)$);    \coordinate (MID)     at ($(TAIL)!0.75!(NOSE)$);    \coordinate (MID/TOP) at ($(MID)!\aeBodyRadius!90:(NOSE)$);   \coordinate (MID/BOT) at ($(MID)!\aeBodyRadius!-90:(NOSE)$);    \coordinate (NOSE/TIP) at ($(NOSE)!\aeBodyNoseDistance!90:(MID)$);    \coordinate (HIND/TOP) at ($(TAIL)!\aeBodyRadius!90:(NOSE)$);   \coordinate (HIND/BOT) at ($(TAIL)!\aeBodyRadius!-90:(NOSE)$);    \node[fill,circle,inner sep=1pt] at (MID/TOP) {};   \node[fill,circle,inner sep=1pt] at (MID/BOT) {};   \node[fill,circle,inner sep=1pt] at (HIND/TOP) {};   \node[fill,circle,inner sep=1pt] at (HIND/BOT) {};    \draw[rounded corners=10pt]                               (HIND/TOP) --                              (MID/TOP)  --                              node [pos=0.25] (WINDOW/TOP/N) {}                              node [pos=0.50] (WINDOW/BOT/N) {}                              (NOSE/TIP) --                               (MID/BOT)  --                              (HIND/BOT);     \coordinate (WINDOW/TOP) at (WINDOW/TOP/N.center);     \coordinate (WINDOW/BOT) at (WINDOW/BOT/N.center);      \coordinate (WINDOW/RIG/T) at ($(TAIL)!(WINDOW/TOP)!(NOSE)$);     \coordinate (WINDOW/RIG)   at ($(WINDOW/TOP)!(WINDOW/BOT)!(WINDOW/RIG/T)$);      \draw (WINDOW/TOP) -- (WINDOW/RIG) -- (WINDOW/BOT);      \draw[red] (TAIL) -- (NOSE);  \end{tikzpicture}  \end{document}     The "red" line runs down the center of the plane clearly shows how my perpendicular is not what it should be.  UPDATE  What seems not to be working is the following snippet of code:      \coordinate (WINDOW/RIG/T) at ($(TAIL)!(WINDOW/TOP)!(NOSE)$);     \coordinate (WINDOW/RIG)   at ($(WINDOW/TOP)!(WINDOW/BOT)!(WINDOW/RIG/T)$);   The projected points do not seem to lie on the appropriate perpendicular.  In particular, (WINDOW/RIG) should lie above the red line since the line through (WINDOW/TOP) and (WINDOW/RIG/T) should be perpendicular to the red line through (TAIL) and (NOSE).


I have googled for the "meaning of universe" where I found the following: "all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies; it has been expanding since its creation in the Big Bang about 13 billion years ago."  Now,I have heard about big bang theory which tells that universe was initially a point of infinite density .But in the above definition I see space is also included in the universe. so if the universe was initially a point then what was outside that point? And how this point is expanding if there is nothing outside it? That is why I don't understand the balloon analogy also which is expanding in space. But here the universe itself contains the space according the google definition.  Probably I have this question in my mind because I couldn't visualize how the space meets on itself in 3 dimension like earth's surface does on 2 dimension.

If the universe is expanding, what is it expanding into? When the big bang happened where did it occur?  When the big bang happened how did it occur?  Where did the energy come from? Energy can not be created or destroyed does that mean, energy has existed before the universe was here?


It seems to be caused by the SSD disk installed instead of an optical drive, in the relevant questions about Linux the suggested solution is like:  echo "disable" > /sys/firmware/acpi/interrupts/gpe13   How can I disable such an interrupt in Windows?

I searched a lot about this online and couldn't find a solution, I turned off fast startup as many answers have suggested. But it didn't work ,  The problem happened after I connected a secondary hard drive to my laptop removing the dvd drive , whenever I remove the secondary hard drive , above processes act normal. I have a SSD as my primary drive , the problem happens only when the secondary drive is connected , I desperately need a solution since this is killing my computer.


I send a Formdata with an Ajax request and try to read it in my php file. But in the php file, when i try to read what is in the $_POST with my key i see nothing. I don't understand why.  I did some research on the forum and tried to see why my code isn't working as i wanted to.   EDIT :   I saw the differents links but i was wondering i there is any ways to do it without JQuery.  My ajax call   function pageSend_DataRun () {     var formElement2 = document.forms.namedItem("data_to_send_general");     ajaxCallUrl ( "send.php",new FormData(formElement2), pageconfig_acq_generalDataCallback ); }   function ajaxCallUrl ( url, params, callback /*, ... */ ) {   var xhr = new XMLHttpRequest();  xhr.callback = callback;  xhr.arguments = Array.prototype.slice.call( arguments, 3);  xhr.onload = ajaxSuccess;  xhr.onerror = ajaxError;  xhr.open( "POST", url, true );  xhr.setRequestHeader("Content-Type", "multipart/form-data");  xhr.send( params ); }   EDIT2 :   I found the solution there : [  I deleted the line to "setRequestheader" in my ajax configuration and it started working.       function ajaxCallUrl ( url, params, callback /*, ... */ )     {       var xhr = new XMLHttpRequest();      xhr.callback = callback;      xhr.arguments = Array.prototype.slice.call( arguments, 3);      xhr.onload = ajaxSuccess;      xhr.onerror = ajaxError;      xhr.open( "POST", url, true );       xhr.send( params );     }

I would like to upload a file asynchronously with jQuery.     $(document).ready(function () {     $("#uploadbutton").click(function () {         var filename = $("#file").val();          $.ajax({             type: "POST",             url: "addFile.do",             enctype: 'multipart/form-data',             data: {                 file: filename             },             success: function () {                 alert("Data Uploaded: ");             }         });     }); });  File <input type="file" id="file" name="file" size="10"/> <input id="uploadbutton" type="button" value="Upload"/>     Instead of the file being uploaded, I am only getting the filename. What can I do to fix this problem?


This is Exercise 3.1.A. in      Suppose that $\pi: X\rightarrow Y$ is a continuous map of differentiable manifolds. Show that $\pi$ is differentiable if differentialble functions pull back to differentiable functions, i.e., if pullback by $\pi$ gives mpa $\mathcal{O}_Y\rightarrow \pi_*\mathcal{O}_X$.   Let $f: V\subseteq Y\rightarrow \mathbb{R}$ be a differentiable function on an open subset of $Y$. Let $(U,\phi)$ be a chart of $X$, $(V,\psi)$ be a chart of $Y$. Then $f\circ\pi(\phi^{-1})$ is differentiable and $f\circ\psi^{-1}$ is differentiable. We need to show that $\psi\circ\pi\circ\phi^{-1}$ is differentiable. I don't know how to prove this.   Can we say that since $(U,\psi\circ\pi)$ constructs a chart of $X$, by the compatibility, $\psi\circ\pi\circ\phi^{-1}$ is differentiable? This seems true but this does not use the fact that $f$ is differentiable.  Sorry I have no background of Differentiable Manifolds. Any help would be appreciated.  I also saw this post: , but I don't understand how $\gamma$ is smooth in the answer. $\gamma=\beta\circ\rho$, where $\rho$ is defined to be smooth, but $\beta$ is not.


Since frames of reference are arbitrary, I can define a frame of reference that moves backwards with a speed greater than $c$, then any static object in that frame of reference is already traveling forwards faster than $c$! So what does "nothing can travel faster than light" exactly mean, and where does it apply?

I was told that the Galilean relative velocity rule does not apply to the speed of light. No matter how fast two objects are moving, the speed of light will remain same for both of them.   How and why is this possible?   Also, why can't anything travel faster than light?


I have tried to set the environment variables through command prompt and through control panel. but when i run the echo command its not showing the added path. Please help me to add the path.

Questions about    setting environment variables the PATH   are very common here, and in most cases the answers are very similar to each other. In the future it would be nice to have a good Q/A for this.  So the question is: What are environment variables, like the executable PATH, and how can I change and use them on major operating systems?  A good answer would include a simple explanation of what environment variables and especially PATH mean to the OS, as well as simple guidelines on how to set and read them accordingly.


I am not a heavy user of StackOverflow due to various time constraints I face. As such, I sometimes see some very-low quality questions where OPs ask someone to get their work done (a.k.a. "I don't wanna code, can someone do it for me?") and have a hard time trying to figure how to handle them.  When I see such a thing, which is the correct way to flag for moderator attention? Should this kind of question be tolerated inside StackOverflow?

Just recently,  question was posted. Here's the body of the question:     Write a function called highlight() that prompts the user for a string. Your code should ensure that the string is all lower case. Next, prompt the user for a smaller 'substring' of one or more characters. Then replace every occurrence of the substring in the first string with an upper case. Finally, report to the user how many changes were made (i.e., how many occurrences of the substring there were).      What would a script for this be?   This is basically a "do my homework for me" style question. In the past, I would have voted to close this question for lacking minimal understanding and moved on. However, it looks like this close reason was removed, and I'm having difficulty figuring out which alternative to use (if at all).  Here were some of the close reasons I was considering, and ultimately decided against since they didn't seem to precisely match:   Duplicate of    I sort of doubt there exists a precise duplicate of this question -- the question is a fairly specific request for some code. I could maybe link to a duplicate question that answers a part of the original (for example, checking if the string is lowercase), but it wouldn't answer every aspect of the problem. Problem that can't be reproduced/typographical error    This sort of matches, since it asks the user to produce a SSCCEE, but doesn't really match since there isn't even a problem to begin with (and closing a question because I couldn't "reproduce" a non-existent problem feels a bit silly to me) Unclear what you're asking    It's pretty obvious what the user is asking -- I could produce a 5 line script in about 20 seconds that precisely matches his spec. Too broad    The text for "Too broad" states that "There are either too many possible answers, or good answers would be too long for this format". This doesn't apply to this question -- once again, the answer I could give would be fairly short and would closely resemble solutions other people would give.   So, what should I do here? Am I misunderstanding how the close reasons should now be used? Should I use the "other" close reason and explain that the OP should have put in more effort? Should I simply downvote, perhaps leave a comment, and move on? Or is the new policy to embrace these kinds of questions and just post an answer?


I know that the new rMBPs have no "user-serviceable" RAM. But is it possible to solder a new RAM chip onto a 2015 rMBP? Given that the technician doing this is able to install the new chip without damaging anything, would it work?

I love everything about my Macook Air except its very low maximum memory (and yes I bought it with the maximum available at the time).  So I'm thinking "I know how to solder... how hard can it be?".  It's not that unusual for the theoretic limit at the time a computer is manufactured to be surpassable later when modules with more memory become available.  Is  based solely on the assumption that no one knows how to solder?  Or is it massively more difficult to solder new memory into a laptop than it is to solder some simple electronics project?  Are there any big difficulties other than just the need to solder the memory in place (and unsolder the old memory)?


How can I update password or other attributes in connection string in XML using c# .  <?xml version="1.0"?> <configuration>     <connectionStrings>         <add name="abcConnection" connectionString="server=10.10.12.12;database=Test1;uid=myUID;password=hello;timeout=20;"providerName="System.Data.SqlClient" />         <add name="123Connection" connectionString="server=10.10.23.45;database=test2;uid=MyUSI;password=hello;" providerName="System.Data.SqlClient" />     </connectionStrings> </configuration>   it can be any xml file not the config from the same application . Please help.

How can I change an attribute of an element in an XML file, using C#?


Is it possible to take an input of range greater than what C/C++ provides? Is it possible to accept an input range greater than that of unsigned long long and even larger up to the range of 10^1000? If it is possible in C/C++, please answer how it can be done, thanks.

What is the best way to handle large numeric inputs in C++ (for example 10^100)?   For algorithms I usually switch over to ruby and I sometimes use strings.  Any other good methods?


we already checked with AirAsia airlines. they need a death certificate and cremation certificate for security purpose. They asked us to check with the customs department of India.  but I'm not sure about India customs  What are the rules and regulations we must follow?

Recently our beloved father passed away in the USA. We have already performed his cremation, and now we are planning to take the cremated remains to India. We don't know anything regarding the procedure.  Can we carry cremated remains while we travel to India?  What are the rules and regulations we must follow?


I am getting the following error message. Please help  $sudo apt-get install firmware-b43-installer [sudo] password for sophon:  E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

I get this error when trying to use apt-get:  E: Could not get lock /var/lib/dpkg/lock - open (11 Resource temporarily unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/) is another process using it?     How can I fix this?


so I am writing a JavaFX program for fun and my main method is throwing this I know it is a null pointer exception but I don't see how to fix it please help and thanks.  Exception in Application start method java.lang.reflect.InvocationTargetException     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)     at java.lang.reflect.Method.invoke(Method.java:498)     at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)     at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)     at java.lang.reflect.Method.invoke(Method.java:498)     at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767) Caused by: java.lang.RuntimeException: Exception in Application start method     at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)     at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)     at java.lang.Thread.run(Thread.java:748) Caused by: javafx.fxml.LoadException:  /C:/Users/Benaiah/Desktop/Java/D&D_5e_Characture_Generator/target/classes/GUI.fxml      at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2579)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)     at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)     at com.gmail.frazee.benaiah.Main.start(Main.java:13)     at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)     at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)     at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)     at java.security.AccessController.doPrivileged(Native Method)     at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)     at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)     at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)     at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)     ... 1 more Caused by: java.lang.NullPointerException     at com.gmail.frazee.benaiah.Controller.initialize(Controller.java:23)     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)     ... 17 more Exception running application com.gmail.frazee.benaiah.Main  Process finished with exit code 1   and this is my Mian class as you can see its very basic so I don't understand why its giving me this from what i have read this should work thanks for any help you give.  package com.gmail.frazee.benaiah;  import javafx.application.Application; import javafx.fxml.FXMLLoader; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.stage.Stage;  public class Main extends Application {      @Override     public void start(Stage primaryStage) throws Exception{         Parent root = FXMLLoader.load(getClass().getClassLoader().getResource("GUI.fxml"));         primaryStage.setTitle("Hello World");         primaryStage.setScene(new Scene(root, 300, 275));         primaryStage.show();     }       public static void main(String[] args) {         launch(args);     } }

What are Null Pointer Exceptions (java.lang.NullPointerException) and what causes them?  What methods/tools can be used to determine the cause so that you stop the exception from causing the program to terminate prematurely?


Does a stack subsite exist for the aforementioned class of individuals or those interested in that field? Does a subsite along these lines already exist?

I have an idea or subject that should have a Q&A, and want to propose a new site. How can I do this?  Related:


Can Network Adapter RTL8821E be made to work on Ubuntu 18.04?  If so, what driver is needed?

I'm trying to install drivers for my Wifi on my HP All-in-one desktop. I've been told to show the output of the command "sudo lshw -C network" so here it is:  *-network description: Ethernet interface product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller vendor: Realtek Semiconductor Co., Ltd physical id: 0 bus info: pci@0000:01:00.0 logical name: enp1s0 version: 15 serial: 48:ba:4e:5c:06:5f size: 100Mbit/s capacity: 1Gbit/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8168h-2_0.0.2 02/26/15 ip=192.168.1.21 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s resources: ire:31 import:e000(size=256) memory: fea04000-fea04fff memory:fea00000-fea03fff  *-network UNCLAIMED description: Network controller product: Realtek Semiconductor Co., Ltd. vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:02:00.0 version: 00 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress cap_list configuration: latency=0 resources: import:d000(size=256) memory:fe900000-fe90ffff   Output from "lspci -nnk | grep -A2 0280":  02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter [10ec:c821] Subsystem: Hewlett-Packard Company RTL8821CE 802.11ac PCIe Wireless Network Adapter [103c:831a] 03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5229 PCI Express Card Reader [10ec:5229] (rev 01)


I've just seen a number of posts in the Low Quality Posts queue which appear to have multiple identical automatic comments from a reviewer:    (now deleted; 10K+ only)  (now deleted; 10K+ only)  (now deleted; 10K+ only)   Given that all the comments have almost identical timestamps, this seems to be a bug.   Obviously, I can just flag these for deletion, but I haven't yet because I want to make sure non-moderators can see this behavior.

came in Low Quality Posts review which was  as "This is commentary on another post, not an answer" by *. But the comment was added 5 times automatically on behalf of that user.        First four comments' time is 2013-07-15 10:23:18Z while the last one's time is 2013-07-15 10:23:19Z. Those comments are still exist. 10K+ users can see that.  Is this a bug or something else?  * Because the comment is added on behalf of that user.


This is just an example picture, but I keep running into this problem where i create a vert in edit mode and extrude it, then create faces, then merge the verbs/ filling holes to another object then subdivide it. And this is us the result. I made sure there were no faces in between. please help. I'm using Blender 2.8

Amateur with Blender here, using 2.8, having an issue with the Subdivision surface modifier. I have a very simple shape here and I'm trying to extrude while using the modifier, I have this one part of the mesh that sticks to the edges of the model.    I've tried everything I could think even, I've even deleted all the vertices in that area and rebuilt it from scratch and that darn thing just reappears. If I delete all the edges and then just fill in the new face, it'll just move to the next edge down. I definitely don't have any overlapping points.


I've finished my work.   I finished my work.     When do I use one or the other?

Non-native speakers often get confused about what the various tenses  and aspects mean in English. With input from some of the folk here I've put together a diagram that I hope will provide some clarity on the matter.  I offer it as the first answer to this question. Consider it a living document. Input is welcome, and good suggestions will be  incorporated into the diagram.    Nota bene: What this is not is a discussion of whether there are  more than two tenses in English. , to which this question is not intended to supply arguments one way or the other.  Here, the aim is to provide an overview of what constructions English-speaking people use for conveying information about actions referring to past, present, and future, and to provide it first and foremost to precisely the people who are likely to use "tense" as a catch-all term in their search, rather than to linguists who know better.  Breaking News There is now an excellent ELU blog article titled  . It is highly recommended reading.


So I know how to get Netflix Desktop and watch Netflix via Firefox.  However, I have a Google Chromecast and like to stream Netflix to my TV.  In order for me to do this, I have to be watching Netflix IN CHROME.  I have yet to find a way that actually works to get Netflix streaming in Chrome on Ubuntu 13.10.  Does anyone have any insights?

Is there a way to stream Netflix content to my Ubuntu machine?


I'm working on a racing game which will have a top view from the back camera. The image below displays a similar example. I am confused about how to achieve the movement of the road if parallax scrolling is used. The road gets narrow as we move forward whereas it is broader closer to the camera. Should I focus on parallax scrolling to achieve this or is there some other technique to work with such games?  p.s. I'm using cocos2d-x as the gaming engine.

I want to create the illusion that a man is running down a long road i.e. this pic    If you have played Temple Run on the iPhone, it's the same principle, but instead of a temple it's a normal road.   I want to know how this is implemented. For example, do I just repeat this road image in a loop?


I track links clicked on my page with some jquery like so:  // Track when a visitor clicks a link $( document ).ready(function() {      // Add an event handler to all body anchor links     $( "body" ).find("a").click(function() {           ga('send', 'event', document.title, 'Link: ' + this.innerHTML, '');     });       });  This works very well for static page content.  However, some of my pages load in partial page content dynamically from elsewhere on my site using Jquery load() method.  e.g. $( "#result" ).load( "ajax/test.html" );  I have noticed that when I click on a link on this dynamic content, the link isn't getting tracked in GA.   I guess this makes sense, the link event handlers are added when the page is initially loaded, any content pulled through after this won't have these event handlers registered...    So my question is, how do i track links clicked for content that is added dynamically after the page has loaded? Should I add my event handler code (above) to a function which i can call on page load then after any dynamic content has been added, telling it to scan the page again?  Will that cause a conflict with any original event handlers or will it override them?  thanks

I have a bit of code where I am looping through all the select boxes on a page and binding a .hover event to them to do a bit of twiddling with their width on mouse on/off.  This happens on page ready and works just fine.  The problem I have is that any select boxes I add via Ajax or DOM after the initial loop won't have the event bound.  I have found this plugin (), but before I add another 5k to my pages with a plugin, I want to see if anyone knows a way to do this, either with jQuery directly or by another option.


Can anyone help me or at least give me some hints   how to prove following inequality  :  $ \lvert z-a\rvert \le \lvert \lvert a\rvert-\lvert z\rvert\rvert + \lvert z\rvert*\lvert arg (z/a)\rvert $  for any $ z, a \in \Bbb C, a \neq 0$

If $z$ is any non-zero complex number, how to prove the following inequality? $$ | z-1 | \le | | z | -1 | + | z| \cdot | \arg z | $$  Hints please!


I have the following code to read a line from a file and if it is equal to "true", set a boolean value to true, and if not, set the boolean to false:  BufferedReader reader = new BufferedReader(new FileReader(optionsFile)); stringFromFile = reader.readLine(); System.out.println("SFX plain text: " + stringFromFile); if (stringFromFile == "true") {     SFX = true; } else {     SFX = false; } System.out.println("SFX: " + SFX);   However, when executed, the following comes up in the log (I have excluded the package name because it has personal details on it):  04-09 23:35:39.980 9686-9686/<PACKAGE NAME> I/System.out: SFX plain text: true 04-09 23:35:39.980 9686-9686/<PACKAGE NAME> I/System.out: SFX: false   Obviously, the if statement is evaluating the string incorrectly, but I've tried many things, and I've been unable to fix it. Does anyone know what's wrong, or how to fix it? Any help would be much appreciated.  P.S: If it's relevant, the text file is written with the following code:  writer = new BufferedWriter(new FileWriter(optionsFile)); if (SFX) {     writer.write("true");     System.out.println("SFX: true"); } else {     writer.write("false");     System.out.println("SFX: false"); } writer.newLine(); writer.close();

I've been using the == operator in my program to compare all my strings so far. However, I ran into a bug, changed one of them into .equals() instead, and it fixed the bug.  Is == bad? When should it and should it not be used? What's the difference?


The current reputation value (rep) of StackOverflow (SO) users is mostly shown in a short form beside their name on all possible occasions. I see values like 1, 23, 345, 12.3k or 456k. Just out of interest: what abbreviation rule works behind it?  I found a partial answer on this question  which leads to the conclusion that after 9,999 follows 10k, but that's just a guess, since 10,0k would also make sense, i.e. it's not clear how many digits will be shown and how/if rounding is involved (or truncating).  I think a tiny comment added to some help page should describe how the rep value is actually formatted in the SO pages?

How many thousands of reputation points are necessary before the score is converted from n,000 to nk?


As far as my understanding goes finalize() and GC are two different aspects. GC uses finalize() method to free Object memory. We cannot state when GC will occur(even if we explicitly call System.gc()). But we can explicitly call finalize() on an Object.  Will the function be executed immediately(memory freed) or it waits till GC occurs like System.gc() call?   Also as per the docs the finalize method is never invoked more than once by a Java virtual machine for any given object.  So what happens when we call finalize() first and GC happens at a later point of time.   If object memory is not freed on explicit call to object.finalize() then would't  it being called again in the GC process violate the calling only once rule?

If I call finalize() on an object from my program code, will the JVM still run the method again when the garbage collector processes this object?  This would be an approximate example:  MyObject m = new MyObject();  m.finalize();  m = null;  System.gc()   Would the explicit call to finalize() make the JVM's garbage collector not to run the finalize() method on object m?


My redshift does only work if there is an internet connection on my notebook. Is there a workaround? It's not convenient that one can't specifiy this inside the software. This is my terminal output:  empedokles@thinkpad:~$ redshift Trying location provider `geoclue'... Started Geoclue provider `Geoclue Master'. Service »geoclue« is used. Could not get location (3 retries left): Geoclue master client has no usable Position providers. Couldn't get position from Service. empedokles@thinkpad:~$

It seems redshift doesn't run without an active internet connection. If so, is there some way it could be run when there's no connection to the Internet?


I have my ~/ directory that is being flooded by ".Xauthority.43652W" files with "43652W" being any combination of letter and digits...  I only have 40 of these files for the moment, but it's ever growing and I don't want to pollute my ~/ too much.  Any idea what should I do ?

I'm using Ubuntu 13.04 on a Lenovo X220.  Why do I have so many .Xauthority.* files in my home directory? I.e  .Xauthority .Xauthority.0JW6UW .Xauthority.2HWRVW .Xauthority.2TA6VW .Xauthority.49F8VW .Xauthority.4E27UW .Xauthority.7CLTVW .Xauthority.8JGGXW .Xauthority.96SAVW .Xauthority.AOUFVW .Xauthority.ASDOVW .Xauthority.CGVJXW .Xauthority.E0ZSVW .Xauthority.E5VZWW .Xauthority.FE64UW .Xauthority.FIHDWW .Xauthority.HL45VW .Xauthority.HYCCVW .Xauthority.ILUEWW .Xauthority.JXJHVW .Xauthority.K1QJXW .Xauthority.KXSOVW .Xauthority.LEKEVW .Xauthority.M48WVW .Xauthority.M6QTVW .Xauthority.MW6NWW .Xauthority.N57TWW .Xauthority.O5HAWW .Xauthority.OIC5VW .Xauthority.P2RPVW .Xauthority.Q0FRVW .Xauthority.QW01WW .Xauthority.RDW5WW .Xauthority.T0TLWW .Xauthority.TSO4WW .Xauthority.U6R9VW .Xauthority.V3KAWW .Xauthority.W8Z1WW .Xauthority.XDLGVW .Xauthority.XOOHWW.Xauthority.XUICVW  They are all zero bytes except the first, with timestamps all over the place.  What are these, and are they safe to delete?


I have a triple boot set-up:    Ubuntu GNOME   Xubuntu   Windows 7    Ubuntu GNOME login loops even with guest user. After installing Ubuntu GNOME 16.04 I didn't get the chance to install Nvidia Server Settings before having to reboot to a black screen. I purged all old drivers, installed correct Nvidia drivers 3.04.132(304) in terminal, and now I get this login loop at the login screen. I never had this problem in 2+ yrs. when I triple booted Windows 7, Linux Mint and Ubuntu 14.04  withGNOME shell. I've tried the nomodeset and ".Xauthority" tricks, but no dice. . .   lspci | grep VGA    00:0d.0 VGA compatible controller: NVIDIA Corporation C61 [GeForce 6150SE nForce 430] (rev a2)  dpkg -l | grep -i nvidia    ii  libcuda1-304                                  304.132-0ubuntu0.16.04.2                      amd64        NVIDIA CUDA runtime library ii  nvidia-304                                    304.132-0ubuntu0.16.04.2                      amd64        NVIDIA legacy binary driver - version 304.132 ii  nvidia-opencl-icd-304                         304.132-0ubuntu0.16.04.2                      amd64        NVIDIA OpenCL ICD ii  nvidia-settings                               361.42-0ubuntu1                               amd64        Tool for configuring the NVIDIA graphics driver  dkms status  nvidia-304, 304.132, 4.4.0-47-generic, x86_64: installed nvidia-304, 304.132, 4.4.0-51-generic, x86_64: installed nvidia-304, 304.132, 4.4.0-53-generic, x86_64: installed   I'm still fairly new to troubleshooting and solving errors. I've searched for answers and tried a few but nothing solved my issue.

My Ubuntu is stuck in a login loop when trying to enter my desktop. When I login, the screen gets black and soon after that the login screen comes back.   I've read that the problem might be caused by an error depending on the graphics, here's my graphics card: ATI Radeon 7670M


I am a newbie in Linux.Whats is the complete process to zip and unzip a directory and its files.Please mention if any installation has to be done.

Just downloaded a .zip file from the internet. I want to use the terminal to unzip the file. What is the correct way to do this?


Im trying to force Latex to do a \newline on the text of my curly brace, or it doesn't allow me and the result is the following:   As you see, there are some curly braces very close, so the texts overlap. I'd like to force a \newline, but it doesn't allow me! =(  A code of one of my curly braces:   %Brace \draw[decorate, decoration={brace, mirror}] let \p1=(pVI11.north), \p2=(pVI11.south) in ($(-9.8, \y1+1.5em)$) -- ($(-9.8, \y2-1em)$)  node[at start, left=10pt, rotate=90] {Creation fichier \newline shape.tex};    Thanks 4 ur help! ^^ (and sorry 4 my english... ^^ )!Bye!Gemma

How can I insert a line break in a TikZ node? Simply putting \\ where I want the break doesn't work (see MWE).  Is there a way to make lines break automatically at some specified width?  And can I control the alignment of the text (left, right, centered, justified)?  \documentclass{article} \usepackage{tikz} \begin{document} \begin{tikzpicture} \node {First line\\second line}; \end{tikzpicture} \end{document}


I saw a lot of tags that don't make any sense on stackoverflow, many don't even have a description.  How these should be handled? Is there a functionality like flag for questions?

So today I noticed a question that had the  tag. As the question was not about JSFiddle, and only included a link to the site, I thought somebody has just created this for the sake of it. So I decided the best action would be to remove it, and try to stop it from getting out of control.  But then I searched (clicked the tag) for other questions that used it and I was amayonaised to see over 500 questions had the very same tag! Most of which were incorrectly tagged. So I cleaned up a couple and then quickly got bored.  So I am wondering, aside from going through them all by myself, is there a more efficient way?  I think it would be a great idea if there was some feature (probably an admin feature) that allowed a new tag queue to be added to the review list. I think this could work well as follows:   Somebody brings up the problematic tag in question (e.g. Me on here) An admin reviews my concern, and decides that the tag is very misused That admin adds the tag for review in a (temporary) new review queue. All users that can review can then go through existing tags, and vote for "No action" or "Remove tag" The world becomes a slightly better place   ...or not?    By the way, I tried to add some new tags to this post but I don't have the rep. So if someone could create them for me that would be swell: "musefan", "today", "sunny-spells", "pointless-tags"


Let $ f $ be a twice differentiable function with $ f (0) = 0, f (1) = 1$ and $ f '(0) = f' (1) = 0 $, then $ 4 \leq | f'' (x ) | $,  for some $ x \in [0,1] $.  I tried using the mean value theorem for derivatives with  $ \dfrac{f '(1)-f' (0)}{f (1)-f (0) } = f '(c) = 0$  so there is a value at which $ f ''(c) = 0 $, but that did not help me.  Any ideas? Any help is appreciated.

Let $f\in C^2(\mathbb [0,1],\mathbb [0,1])$ such that $f(0)=f'(0)=f'(1)=0$ and $f(1)=1$ Prove that  $\max_{[0,1]}|f''|\geq 4$  Progress Applying Cauchy mean value theorem three times proves the existence of  $\xi\in (0,1)$ such that $f'(\xi)=1$ $\eta\in(\xi,1)$ such that $\displaystyle f''(\eta)=\frac{1}{\xi-1} <0$ $\beta\in(0,\xi)$ such that $\displaystyle f''(\beta)=\frac{1}{\xi}>0$  If $\displaystyle \xi\leq \frac{1}{4}$ or $\displaystyle \xi\geq \frac{3}{4}$, we're done. What about other cases ? I haven't used the continuity of $f''$ yet...


Is there an example of a (path-connected) subspace of $\mathbb{R}^3$ which has a nontrivial finite fundamental group? If not, why?

Can the fundamental group of an open connected subset $X$ of $\mathbb{R}^n$ have a torsion element?


The way I understand the uncertainty principle is that it's not even really about quantum mechanics specifically -- it's just a property of waves.  e.g. A periodic wave doesn't even have a well defined position, so in order for wave-function to have a well-defined position, we have to represent it as the superposition of many different waves which will have varying momentums.  But what's this got to do with multiplication of operators not being commutative?  It makes sense that there would be some limit to how well can define wave properties that are linked in this way, but what does it matter what order we do things in? Edit: This question is not the same as the one linked.  That question is about the algebra.  My question is about how the algebra is related to the geometry of wave mechanics.

I read that the non-commutativity of the quantum operators leads to the . What I don't understand is how both things hang together. Is it that when you measure one thing first and than the other you get a predictably different result than the measuring the other way round? I know what non-commutativity means (even the minus operator is non-commutative) and I think I understand the uncertainty principle (when you measure one thing the measurement of the other thing is kind of blurred - and vice versa) - but I don't get the connection. Perhaps you could give a very easy everyday example with non-commuting operators (like subtraction or division) and how this induces uncertainty and/or give an example with commuting operators (addition or multiplication) and show that there would be no uncertainty involved.


In the definition of the generalized linear models (GLIM), $g(\mu) = \beta^T X$, i.e. the link function of mean is modelled to be linear in explanatory variables.  But GLIM is said to be generalization of the general linear model. In the general linear model, however, $\mu$ is only required to be linear in parameter $\beta$, not necessarily in $X$.  So this makes me to ask if $g(\mu)$ in GLIM is only required to be linear in $\beta$ and not necessarily linear in  $X$? Thanks!

If I am correct, the linear regression model is said to be a model where the response is linear in the parameters. That allows the response to be nonlinear in the predictor variables.  I was wondering if there is a name for the model where the response is linear in both the parameters and in the predictor variables, so that people will easily understand its difference from the linear regression model?


Which one is the formula of angular velocity? Is it $\omega= vr$? If not then why does the source below use $mvr=nh/2\pi$, where $mvr$ is angular momentum and $vr$ is angular velocity? Again $\omega=v/r$ shows radian per second. I saw $\omega= vr$ in one book and $\omega= v/r$ in another!


Three months ago, I posted an answer to . My answer was upvoted, and is currently marked as .  In the past week, I've found  which I believe to be a much simpler and more effective solution than what I'd previously posted.  How should I handle finding a better solution to a question I've already answered?  Should I edit my existing accepted answer, or should I post it as a separate answer?

When is it okay to post two answers to one question?


I have this code:  for i in ["Dia", "DiaSemana", "Mes", "Año", "Feriado"]:     plt.subplot(1,2,1)     sns.boxplot(x=i, y="Y", data=df)      plt.subplot(1,2,2)     sns.boxplot(x=i, y="Temp", data=df)      plt.tight_layout()     plt.show()   It gives me all the plots I need. Here is one-time loop:    As you can see, the x axis is overlapped and I'm trying to increase the horizontal size of each plot in order to have a better visualization.

How do you change the size of figure drawn with Matplotlib?


I am trying to figure out how to put a value (e.g. ∆H>0 or E_cell=1.10 V) to the right  of a chemical equation. For example  \ce{Cu ^{2+}(aq) + Zn(s) -> Cu(s) + Zn^{2+} (aq) E_{cell}^\standardstate = \SI{1.10}{\volt}}   However the value is jammed up against the equation and using \verbatim{   } seems a bit crude.  Thanks,  Cam

I'm new to Latex and I'm having some trouble with a simple chemical equation. I have the following code:  \documentclass{article} \usepackage[version=3]{mhchem} % Package for chemical equation typesetting \usepackage{amssymb}  \begin{document} \begin{equation} \ce{N2(g) + 3H2(g) -> 2NH3(g)}} \end{equation}   $\Delta H_{\mathrm{f}}^\circ = \SI{-92.5}{kJ}$ \end{document}   This prints everything that I need, but on separate lines. I would just like the heat of formation (deltaH=-92.5kj) to be inline with the equation. I've tried multiple approaches, but keep getting stuck. I haven't seen this discussed on TEX or elsewhere.


Can anybody give us a hint how to prove  the irreducibility of polynomial  $x^k-x^{k-1}-\ldots-x-1$ over $\mathbb{Q}$ ?  Thanks in advance. Dusan

Prove that $P_n(X) = X^n - X^{n-1} - X^{n-2} - ... - X - 1$ is irreducible over $\mathbb{Z}$ for all $n$.  I was able to prove the result for $n=2^k-1$ by applying  to $P_n(X+1)$. But for other values of $n$, I'm stuck. Has anyone an idea on this ?


I've been installing Ubuntu 18.04 and found out that there's this new option called Minimal Install. It says, "Web browser and basic utilities" will be installed, but I'm not given a specific list of removed programs.  I've searched the web and couldn't find the list . Can anyone help me with the list of missing programs in Ubuntu 18.04 minimal version compared to a normal installation?  Is there any official resource that tells the missing programs? I know there won't be programs like LibreOffice, games etc, but I need to know all programs that are removed from the minimal version.

Ubuntu 18.04 brings a new feature "minimal installation". I could not find any official documentation about which packages are not installing when we checked "minimal installation".   Can you please provide a source/doc for package list?


I've done   sudo apt install conky-all cp /etc/conky/conky.conf ~/.conkyrc sudo apt-add-repository -y ppa:teejee2008/ppa sudo apt update   and then;   sudo apt install conky-manager   I get;  Reading package lists... Done Building dependency tree        Reading state information... Done E: Unable to locate package conky-manager   How can I overcome this problem?Why I am unable to locate the package?

I need to install Conky Manager to add themes and change settings  to make my own preferences on a desktop screen. However when I type:  sudo add-apt-repository ppa:teejee2008/ppa sudo apt update sudo apt install conky-manager   My Ubuntu says to me that I'm unable to find conky manager package. Can anyone help me to install Conky Manager to personalize my desktop screen properly? Thanks!:)


I've read that if a container carrying a liquid is accelerating in horizontal direction then the pressure at same level is not same. It decreases as we move in tge direction of acceleration. Why does the pressure decrease?

In accelerated fluids, fluid in a container can orient itself in a direction due to acceleration. In that case, pressure at different heights (at the surface) is same (atm). Then at the same height, pressure is different. How does this pressure increase along the horizontal?


Have a workstation that has an SSD for the boot drive (Linux Mint) and (software) Raid 1 array  for data storage. The SSD died, and I've replaced it and reinstalled Mint.   How do I get the OS to recognize and mount the Raid 1 Array at boot? I'm comfortable at the CLI, just don't know how to get this done.

I just upgraded from Ubuntu 10.04 to Mint 16. The installer did not detect my existing RAID 1 array, and I can't access it anymore.  My drives are:  SDA - First RAID Disk SDB - Second RAID Disk SDC - Non-RAID where the OS is installed.   The disks are full of stuff I want to keep, so I don't want to create a new RAID.   On the old machine, the two raid drives became MD0, which was a physical disk for Logical Volume Management.  How do I put the two halves together and get it to mount at boot? (I know how to mount single drives and how to add fstab entries for single drives, but the part I don't know is how to mount the two drives as one disk as a RAID.


I always thought that $force$ is $mass * acceleration$. Well, that's what I learnt at school a while back. Now, I have been enlightened that force is in fact the rate of change of momentum.   What makes this interesting to me, is that this takes into account a change in mass with respect to time as also playing a role in the force. A nice example of this is that of a rocket taking off. But clearly, this was not an example that Newton had in mind.   So my question: What did Newton have in mind of something where the mass changes with time?  I appreciate that my question is similar to say:  but I didn't read anywhere there about the concept of change of mass with time.

Is there ever a situation where the distinction between $F = m \frac{dv}{dt}$ and $F = \frac{dp}{dt}$ is important?  I can't think of a situation where one is true and not the other (assuming only conservation of momentum).  Obviously it is important to take a changing mass into account (e.g. for a rocket) when you're considering a full time evolution, i.e. $F(t) = m(t) \frac{dv}{dt}$ (or in the relativistic case, perhaps something like $F(t) = m(t) \frac{d}{dt} \left( \frac{p}{m} \right)$ with $m$ the rest-mass).  And perhaps there is a nontrivial relationship between the rate of change of mass, and the forces being exerted (again, e.g. with a rocket --- where the mass loss is tied to the propulsion).  What is not clear is that there should ever be a $F = v\frac{dm}{dt}$ term.


I´m trying and trying and the results are bad.  Sometimes, \tableofcontents use red text, other point to a page that is incorrect. If a part is in page 3, the TOC point to page 2.  Are there any package that runs well?, or.. how can I use \tableofcontents with good results?     --------------  edited after Crhistopher comments -----  In this image you can see what I obtain and what I would like to obtain    Inm this code I view in TOC that 3 last items poit to page 4, when in reality they are in page 5.  \documentclass[12pt,a4paper]{article} \usepackage[top=2.5cm, left=3.5cm, bottom=2.5cm, right=2.5cm]{geometry}  % Margenes de la normativa TFG  \usepackage{setspace} % para que no afecte el interlineado a las notas de pié de página \usepackage{blindtext}  % para usar un texto-tipo de ejmplo Lore.... sin teclear a boleo, con \blindtext \setstretch{1.5}  \usepackage{lipsum,blindtext} \usepackage{hyperref} \hypersetup{colorlinks=true, urlcolor=blue}  \usepackage[x11names]{xcolor}  % otra opcion sería \usepackage{xcolor} %\usepackage{xcolor} \usepackage{mathpazo}       % Fuente MathPazo \usepackage{datetime}       % paquete para configurar formato de fecha y hora \settimeformat{ampmtime} \renewcommand*{\noon}{\pmname}  % ----------------------  PSTRICKS --------------- \usepackage{pstricks} \usepackage{pst-node}   \begin{document}  \tableofcontents   \part{Introducción General}   \part{Esquema de Funcionamiento} \blindtext  \section{Búsqueda Tabú (Tabu Search)} \blindtext \section{Enfriamiento Simulado} \blindtext \section{Algoritmos Genéticos}   \part{Ejemplos de Aplicaciones Simples} \blindtext \section{Búsqueda Tabú (Tabu Search)} \blindtext \section{Enfriamiento Simulado} \blindtext \section{Algoritmos Genéticos}  \part{Análisis de su funcionamiento}  \section{Búsqueda Tabú (Tabu Search)} \section{Enfriamiento Simulado}  \section{Algoritmos Genéticos}   \end{document}

I tried anything I could find with \cleardoublepage and \newpage and so on; mostly they use \addcontentsline. I don't need to use it as listof=totoc already puts it into the toc so even if I use \addcontentsline instead I get the same result.  \documentclass[     fontsize=11pt,     DIV10,     ngerman,     paper=a4,      twoside=false,     titlepage,     parskip=half,     listof=totoc,     bibliography=totoc,     index=totoc,     captions=tableheading,     foottotes=multiple,     final ]{scrartcl}  \usepackage[     automark,     headsepline,     ilines ]{scrpage2}  \usepackage[ngerman]{babel} \usepackage[babel,german=quotes]{csquotes} \usepackage[dvips]{graphicx}  \begin{document}  \ofoot{\pagemark} \pagenumbering{Roman} \clearpage \tableofcontents \clearpage \listoffigures \clearpage \pagenumbering{arabic} \section{Test} \label{sec:Test}  Test  \subsection{Test} \label{sec:Test}  \begin{figure}[H]  \centering \caption{Testfig} \label{fig:testfig} \end{figure}  \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test} \subsection{Test} \label{sec:Test}  \end{document}


so I downloaded this gun online, and it has no textures. Usually their is a section on the right with many categories... one lets you add textures, but when I opened this blender file there was no option to add textures, here is a picture.

I accidentally opened too many menus (or windows) and I want to reset them to default.  It is really annoying, and effecting my animation.  Thanks


I saw this on Dribbble and I thought I'd have a go at reproducing it -   But i'm struggling to do so. I've had a play around with shear and rotating but I can't seem to get it to look quite right.   Here's my attempt. I feel like I lose all the readability in the text. The angle matches the top of the paper, but the angle of the text doesn't match the sides. Is there a set way to get this angle/effect or is it just done by eye?

How do I create this type of effect with an image? I'm wondering how to get the thick edges and the tilted look. Is there an online tool that will convert a flat image to look like this?


I am trying to find out the average number of comparisons made by the Binary search. In that, I'm confronted with following summation :- Avg = $(1/n)\sum_{i=1}^{\log_2 n} i*2^i$ In this summation, $i$ are the number of comparisons made at each node in $i^{th}$ level of the Binary tree and $2^i$ is the number of nodes in the tree at level $i$. Please help me solve this summation. If not completely solve the summation, at least please help me get started.

I want to know the general formula for $\sum_{n=0}^{m}nr^n$ for some constant r and how it is derived.  For example, when r = 2, the formula is given by: $\sum_{n=0}^{m}n2^n = 2(m2^m - 2^m +1)$ according to   Thanks!


My query is to find out if a child (Under 18) is travelling with his grandparent,  upon entry I understand he needs to make with his grandparent, as his visa will have the name of The grandparent.  My question is, can he exit UK without them, if he wants to come back earlier then his/her grandparents.

My daughter who is just under 18 has a child accompanied visa to the UK. I am traveling with her to the UK for a few days. We return from UK on the same day except that she returns to India and I am heading to San Francisco an hour later on the same day.   Is that okay or will we have an issue at immigration into the United Kingdom?


How can you evaluate the following integral using residues? $$\int\limits_0^\infty\frac{\ln x}{\left(x^2+4\right)^2}\text{d}x$$

I need a little help with this question, please!   I have to evaluate the real convergent improper integrals using RESIDUE THEORY (vital that I use this), using the following contour:  $$\int\limits_0^\infty \frac{\log x} {(1+x^2)^2} dx$$    Using this contour:     $R>1$ and $r<1$


I want to extend the duration of sudo in Ubuntu 14.04. It is irritating to provide password repeatedly. How can I do it?

I execute quite a lot of sudo commands.  I noticed that if I execute one and then another one within few minutes, the 2nd time I don't get the message:     [sudo] password for my_username:   but I do get it when there is more time between the execution of the two commands.  What's the period of time in which the message is not appearing? How can we check it / update it?


If I use red eyes dmd effect to bring a dragon from the graveyard then send red eyes dmd to the graveyard and then bring it back in the same turn, is it treated as a new monster resetting it so I can re-use its effect to special summon another monster?

So here is one I wish to know:   I use Tri-Gate second effect, which allows me to target and banish one card on the field. Then I link that with another monster to bring out another link. Tri-Gate would be in the graveyard but then I use transcodes effect (1 of the 3 co-links) to bring it back from the graveyard.   Can I use the second effect again?


Is there a simple way to print any method's signature once it's entered?  My current naive solution is to add a System.out.print("method signature") statement before all the methods which prints its name, but then I have to do that even for every getter and setter which is quite tedious.

Is there a way to get the name of the currently executing method in Java?


I'm trying to migrate a MySQL-based app over to Microsoft SQL Server 2005 (not by choice, but that's life).  In the original app, we used almost entirely ANSI-SQL compliant statements, with one significant exception -- we used MySQL's group_concat function fairly frequently.  group_concat, by the way, does this: given a table of, say, employee names and projects...  SELECT empName, projID FROM project_members;   returns:  ANDY   |  A100 ANDY   |  B391 ANDY   |  X010 TOM    |  A100 TOM    |  A510   ... and here's what you get with group_concat:  SELECT      empName, group_concat(projID SEPARATOR ' / ')  FROM      project_members  GROUP BY      empName;   returns:  ANDY   |  A100 / B391 / X010 TOM    |  A100 / A510   So what I'd like to know is: Is it possible to write, say, a user-defined function in SQL Server which emulates the functionality of group_concat?   I have almost no experience using UDFs, stored procedures, or anything like that, just straight-up SQL, so please err on the side of too much explanation :)


I told my better half that she should say she's "getting on the bus" rather than "getting in the bus." She asked me why, because you would "get in the car" and not "get on the car." (You could get on a car, but we'd be talking about riding on the roof.) I couldn't answer why, but I came up with a quick rule, which so far hasn't been proven wrong:  If you can stand up/walk around inside the vehicle, you use on: bus, plane, boat. If you can't stand up/walk around, you use in: car ... what else, go-kart? Haha.  In my mind, when I try to analyse it myself, you are getting inside the bus, you're not getting on top of it. So why "on"? Does anybody know why this is/can tell me reasons for this? P.S. is my rule wrong? I thought of motorcycles/bicycles, but I figure different rules apply for modes of transportation that don't have "cabins." Just some extra info: My linguist friend sent me a link to a pretty cool talk back radio show about the English language called "A Way With Words" -- somebody had recently asked about in a car vs. on a train:  Their consensus is the same as mine (they called it "freedom of movement, or embedded as a unit" [consider the freedom of movement on a train, lol not at rush hour I guess, vs. embedded as a unit like being in a canoe]) however, what @Jonah mentioned about private vs. public buses really does make a lot of sense. P.P.S I would recommend subscribing to A Way With Words if you are learning English, a lover of English, or just want to learn more about it! I've listened to one episode so far and it's quite interesting, not as dry as I imagined a radio show like that would be.  About the hosts: Martha is an author, and Grant is a lexicographer and dictionary editor.

Examples:   In a car, van, etc. On a bus, boat, motorcycle, etc.   How can one decide which preposition to use? Is memorization the only way or is there a better way?  Note: People generally explain this by either distinguishing between open and closed vehicles or between large and small vehicles. However, the examples I've given defeat both explanations.


In sense of classical mechanics+special relativity what is lagrangian of a photon? Lagrangian of a relativistic massive particle is as follows: $$ L_{massive}= -mc\sqrt{c^2-v^2} $$ So is it a zero?

For relativistic massive particle, the action is $$\begin{align}S ~=~& -m_0 \int ds \cr ~=~& -m_0 \int d\lambda ~\sqrt{ g_{\mu\nu} \dot{x}^{\mu}\dot{x}^{\nu}} \cr ~=~& \int d\lambda \  L,\end{align}$$ where $ds$ is the proper time of the particle; $\lambda$ is the parameter of the trajectory; and we used Minkowski signature $(+,-,-,-)$. So what is the action for a massless particle?


How many possibilities are there to arrange the letters of the word MISSISSIPPI, such that no S is next to another S?  Here are some possible examples:   SMSISISIPPI MSISISISPPI MISISISPPIS   Note that there is never something like SSS.  Or in other words: No S touches another S!

How many arrangement of the letters in MISSISSIPPI have at least 2 adjacent S's?  I was thinking that I can glue two of the S's together, so there will be 9 letters plus the special letter SS, and the number of arrangements will be $10!/(2!2!4!)$, this is not the correct answer, but what is wrong with my reasoning.  (the correct answer is $11!/(4!4!2!)-7!/(4!2!)\binom{8}{4}$, I understand the solution)


such as find  MLE of $P(X>12)$ when $X_i$ ~ $N(\mu,\sigma^2) $

Suppose, we have $n$ samples $x_i$ of a random variable: $$x \sim \mathcal N(\mu,\sigma^2) $$ Based on the samples, we want to estimate the probability that $x$ is negative: $$P(x\le0)$$ Intuitively, I would first estimate: $$\hat \mu=\frac 1 n \sum x_i$$ $$\hat \sigma^2={\frac 1 {n-1} \sum (x_i-\hat \mu)^2}$$ and then calculate: $$P(x\le0)=\frac1{\sqrt{2\pi\hat\sigma^2}} \int_{-\infty}^0 e^\frac{x-\hat\mu}{\hat \sigma} dx$$ However $\hat \mu$ and $\hat \sigma$ have variance! If I use this method, I suspect I am ignoring that variance and making an incorrect estimation. Is this reasoning right? If so, how can I estimate $P(x\le0)$ more correctly, taking $\text {VAR}[\hat \mu]$ and $\text {VAR}[\hat \sigma]$ into account?


according to  there is an ubuntu 16 that is certified to work with the lenovo x1 carbon gen6. Can I get it? If so where? If not, why not?  Thanks

Background  My Lenovo X250 is arriving in two weeks, which according to  will work well only with "a special image of Ubuntu pre-installed by the manufacturer."   points out that the X250 has "Excellent" compatibility to the Linux OSes they install. On the other hand, a quick search on  or  shows that a standard image of Ubuntu on the X250 is rife with hardware problems.  Ubuntu Certified Hardware acknowledges this for the X250: "Standard images of Ubuntu may not work at all on the system or may not work well." This  clearly shows the difference between an Ubuntu standard image installation and the one that comes pre-installed by the manufacturer. Hardware seems to work fully on the OEM version.  Question  Any idea where we may access or download these "special images of Ubuntu"?  (Hopefully not only for the X250, but also for the other systems out there.)


From a survey I have answers towards a yes/no question and the survey-respondents are grouped into multiple groups. I now want to know if the proportion of yes-answers for one group differs from the whole survey sample (thus including the subgroup).   I would do this by calculating the standard error. I could do it using the following formula:  $\text{SE} = \sqrt{p(1-p)/n}$  where $p$ is the overall proportion of all yes and $n$ is the total number of answers via all groups.  In the comments to this   it is stated: ". You can test the difference in means between the subset and the overall group as long as you account for the covariance between $\bar{X}_d$ and $\bar{X}$ in your standard error calculation" (with $\bar{X}_d$ being the answers for the subgroup and $\bar{X}$ being the answers for the entire sample).  My question is how to incorporate the covariance into my standard error calculation.

I have the mean and standard deviation of a large sample (30k obs) and the mean and std of a subsample (2k obs). The means are percentage figures (i.e. between 0 and 100% and hence not a normal variate). Also the means are not independent, since one is based on a subsample from the other.    Despite seemingly a harmless question, I could not find an appropriate testing procedure. Any ideas on how to test whether the mean of the subsample is different to the mean of the entire sample are much appreciated.


I am creating a poster using the a0poster package. I want to remove the title of the bibliography which automatically comes up with 'References'.  All I have is this:  \bibliographystyle{plain} \bibliography{mybib}   I have seen this done for other packages but not sure how to do it for the a0 poster package.  Thanks for the help

I'd like to get rid of the bibliography heading:   Please note that I'm using the thebibliography environment.