I made an account for Pokemon go and when i went to the loading screen today, it said it couldn't load and it gave me an option to sign out...so I did to see if I could reload the game and maybe it would let me on, but now every time I put my username and password in and I click the sign in button, it says "unable to authenticate. please try again" and I try and try but it never lets me in. PLEASE HELPPP!😁

Pokemon GO isn't working at all for me right now. I'm in one of the following circumstances and can't do anything:   My game is displaying a "Try Again" message I'm stuck on the Loading Screen When I sign in I get a message that the servers are experiencing problems. I see the map but nothing is loaded, and my team color is wrong The "loading" Pokeball just ends up spinning and I can't catch or interact with things When I try to catch a Pokemon, the Pokeball just sits on my screen doing nothing Gym opponents will drop to 1 HP and won't take any more damage or attack When I open a pokestop, the pokestop image and the name of the pokestop does not load.   What's causing this? Is there a way to fix it?


I have fire in the viewport, but when i enter rendered view or just render the image i only get stuff that looks like dust.

Good day! I am having a problem wherein fire does not render. I followed a . Followed everything in his tutorial. However, the fire in my scene does not render at all. I wanted it to look like rocket thrusters. As of now, this is what I currently have for my Smoke Domain material.  I temporarily set the smoke to 0 because it may be blocking the flame. I've provided the screenshots where the smoke is enabled and disabled. (Forgive the quality of the rendered images, I lowered down the samples to quickly render the image.  And for my scene, this is what it looks like.  I am rendering it using GPU compute. If there's anything missing in the  current scene setup, just ask for it and i'll provide the necessary requirements. I tried searching for solutions but nothing worked out for me. Thank you and have a nice day!


Hydrogen absorption spectrum has dark lines at about 656nm, 434nm, 410nm , etc. I have been told that these are dark because hydrogen has absorbed the light of these particular wavelengths, as these wavelengths correspond to the energy difference of energy levels of hydrogen atom. But wouldn't these photons be re-emitted? And so, there shouldn't be any lines missing(dark) in the spectrum. Plz Help Me out what am I missing?

I was looking at  on why  and emission lines don't cancel out:      An experiment shining light on the material and looking at the   reflected spectrum will see absorption lines at those frequencies,   because the relaxation of the excited electrons will emit back   radiation all around randomly, whereas the reflected spectrum is at a   specific angle.   However it is not totally convincing to me. The photons that get emitted towards the center of the Sun (by the electrons in higher energy states that absorbed a photon earlier) would get absorbed again when they hit a different electron (and then re-emitted) and would eventually make it out. So why don't absorption and emission lines cancel out in our Sun?


Why does shadows reflection got these blurry edges , is it something related to quantum physics , how photon travels to make these outlines look like this?   Does the uncertainty principle plays role in cast of shadows , and is there 100% perfect shadow (even from a small source of light) ?

What are the factors that affect the sharpness of a shadow?   I would think that the distance between the light source and the object, the distance between the object and the shadow, and the size of the light source would all have an effect.   How do they affect the shadow exactly? What is the full explanation?


I was wondering if the following is correct:  Let $V=\bigoplus_{i\in\mathbb N}\mathbb Z$ and $R=\text{Hom}_{\ \mathbb Z}(V,V)$. Regard $R$ as an $R$-module. Then $R$ is free of rank $1$ with basis $\{\text{id}_{V}\}$. Now define a map $\phi$ as follows:   where $f_i: V \to \mathbb Z$ for each $f\in R$ are linear maps. Then $\phi$ is an isomorphism of $R$-modules.  Can I conclude as follows?  (1) Since $\phi$ is an isomorphism of $R$-modules we have $R\cong R^2$.  (2) Due to (1) we have $R^n\cong R^m$ for any $n,m\in\mathbb N$.  (3) Due to (2) we have that $R$ as an $R$-module is free of rank $k$ for any $k\in\mathbb N$.

I'm aware that over a commutative ring, two free finitely generated modules of finite rank are isomorphic if and only if they have the same rank.   I'm trying to understand a curious example of why this does not hold over a noncommutative ring.      Let's take $M=\oplus_{i\in\omega}\mathbb{Z}$. Then let $R=\text{End}(M)$, which is not commutative. Then $R\cong R^2$ as left $R$-modules.   It seems like one could possibly make a basis of $R$ using only endomorphisms which act on the even or odd coordinates of elements of $M$, which might suggest such an isomorphism. Is there a clear proof of why $R\cong R^2$?


I moderate Skeptics, where we have two specific issues that probably are not so bad elsewhere but are terrible for us:   We only allow evidence-based answers We allow very controversial questions on inflammatory topics (e.g. school shootings)   The problem is that  people avoid the "evidence" rule by abusing comments to write "pseudo-answers"--usually, in fact, their personal opinions, without any evidence to back that up. Of course this often leads to flame wars, with people literally insulting each other, and often even purging all the comments does not prevent the flame from restarting soon later.  So we do moderate the comments by asking people to calm down. We do moderate the comment threads by nuking them all when things are out of control. Yet, in some  we have to go through 2-3-4 cycles of "purge all comments".  It would be useful to have the power to prevent commenting on a post altogether for a limited time. A simple "lock" would penalize the OP without any reason. We can certainly do without this feature, but this would be a real time saver. Furthermore, I do think it's better to prevent commenting if the alternative is having 100s of deleted comments, at the very least out of respect for our users' time.

Currently moderators have the ability to lock posts, for any of the following reasons:   Content dispute (~ edit wars), Historical significance (to prevent great but off topic questions from being deleted), and Offtopic comments Wiki Answer   The locks can be applied for an hour, a day, a week, or permanently. This is all great, but:   Locking a post also prevents voting and (more importantly) editing, and  If the locked post is a question, there are other ramifications, such as preventing new answers from being posted.   Those side-effects aren't always desirable for posts that generated a lot of "offtopic comments" and I think we could use a lock that would only lock the comment section. The lock message should point to chat, and ideally should also give the option of migrating the comment thread to chat automagically.  Additionally the comment lock, being a lesser lock, could be available to the OP as well, not only to moderators. Perhaps only after a certain rep level (3K? 5K? 10K?) and perhaps without the option to lock permanently. Getting spammed with inbox notifications on an irrelevant discussion happening on one of your posts isn't fun, and it's perhaps the only thing I truly hate on Stack Exchange.  Similar feature requests:    (duplicate?)    Relevant discussions:


I have seen the terms self-aware and self-conscious being used interchangeably in discussions of what distinguishes a person from a conscious animal. Is there a difference of meaning between them? I had previously thought the term self-conscious was used only to only to denote a feeling of being acutely aware of oneself in social situations, so I have always preferred using the term self-aware, as Singer does, to indicate the ability to consider oneself as a conscious individual human, existing in time. But is there a separate, philosophical meaning to self-conscious that is different from self-aware?  EDIT - 2021 03 13 - I have accepted @Conifold's suggestion that the linked question provides an answer, but only to the extent that the answer is "No, there is no widely accepted distinction between these terms and their meanings depend heavily on context".

Dictionary definitions  often seem to use the terms sentience, awareness, and consciousness as if they are synonymous with each other. Is this really the case? If not, how do they differ? Some books suggest that sentience and awareness are simply facets of the larger concept of consciousness.


After Ctrl+L or click "Enter Location" from the menu, the tab of nautilus becomes input text.  But how can I go back to the tabs?

When using Nautilus you can use CTRL+L to display the addressbar. How do you revert back to the pathbar? Is there a shortcut key?


In the MWE below, \citet{macdonald2015, macdonald2016} becomes "MacDonald (2015) and MacDonald (2016)". \citep{macdonald2015, macdonald2016} becomes "(MacDonald, 2015; MacDonald 2016)". How do I make it print "MacDonald (2015, 2016)" and "(MacDonald, 2015; 2016)?  \documentclass{scrartcl} \usepackage{fontspec} \usepackage[style=authoryear,natbib=true,backend=biber,sorting=nyt,mincitenames=1,maxcitenames=2,url=false,giveninits=true,uniquename=false,maxbibnames=100,uniquelist=false,dashed=false]{biblatex} \begin{filecontents}{\jobname.bib} @article{macdonald2015,   title = {On Having a Farm},   volume = {42},   journaltitle = {Journal of Science and Stuff},   author = {MacDonald, O.},   date = {2015} } @article{macdonald2016,   title = {Noise reduction in livestock},   volume = {43},   journaltitle = {Journal of Science and Stuff},   author = {MacDonald, O.},   date = {2016} } \end{filecontents} \addbibresource{\jobname.bib} \title{A document} \begin{document} \maketitle In this text I cite \citet{macdonald2015, macdonald2016} for the mwe.  And now i cite the same clever fellow \citep{macdonald2015, macdonald2016} again. \printbibliography \end{document}

I'm using biblatex 1.4b, and Biber 0.9. However, I think the problem is with my settings, not with the versions of those programs.  I'm trying to cite a single author, and produce their name, followed by the dates of two papers, using the authoryear-ibid style, and natbib compatability. Here's my biblatex preamble:  \usepackage[style=authoryear-ibid,natbib=true,backend=biber]{biblatex}   What I want is for the following command: The works by \citet{Blau81, Blau88} ... to produce: The works by Blau (1981; 1988) ... however, what I'm getting is: The works by Blau (1981); Blau (1988)...  I know that biblatex knows they're the same author, since in the bibliography they fall under the same name (i.e. after the first instance of the name, there's just a dash instead of the name)  What am I doing wrong here? I've also tried it with the commands \cite and \cites, and neither produces what I want.   (crossposted with comp.text.tex)


I know this question has been asked and answered for previous versions of Ubuntu, but in my searches I have not seen anything directly related to v. 18.10. I am running Ubuntu 18.10 on a System 76 Lemur laptop, with an Intel® Core™ i3-7100U CPU @ 2.40GHz × 4 and an Intel® HD Graphics 620 (Kaby Lake GT2) processor.  At screen resolutions of 1920x1080 and 1680x1050, the system-wide fonts are so small as to be almost unreadable.  One suggested solution has been to adjust the scale in Settings/Displays, but in Ubuntu 18.10 this only toggles between 100 and 200%, neither one of which is satisfactory.   Another proposed solution has been to go to Settings/Universal Access and choose the text size; again, in 18.10 I can only choose between normal or Large text, and I have already set it to Large. This helps the system fonts, such as in the Settings dialogs, but does not help header fonts on applications like Firefox or Thunderbird.  I'd appreciate some more up to date advice on what to do.

I recently installed Ubuntu 18.04 and discovered that the fractional scaling option that was in 16.04 is no longer there. 200% is too big for my display, and  didn't work for me (the options didn't change after running the command).  Is there another way to get fractional scaling?


I got Pokemon GO on a new device as my other one broke, when I press Sign up with Google, it just has a Pokeball in the centre loading and nothing else. the bottom I can cancel still but I don't know how to fix this.

Pokemon GO isn't working at all for me right now. I'm in one of the following circumstances and can't do anything:   My game is displaying a "Try Again" message I'm stuck on the Loading Screen When I sign in I get a message that the servers are experiencing problems. I see the map but nothing is loaded, and my team color is wrong The "loading" Pokeball just ends up spinning and I can't catch or interact with things When I try to catch a Pokemon, the Pokeball just sits on my screen doing nothing Gym opponents will drop to 1 HP and won't take any more damage or attack When I open a pokestop, the pokestop image and the name of the pokestop does not load.   What's causing this? Is there a way to fix it?


I have a currently unfinished basement in a rather new home.  There are a few places that have bay windows, or cantilevers that currently have only a bit of pink insulation thrown in fro the basement.  From what I can tell, the wall up there, plus the floor (sill box) are the part that is outside the house exposed to the elements.  At first, I was thinking of putting some XPS foam along the top, bottom, and the inside wall and stuffing it with some insulation and sealing it.  But then I read this article:   which seems to indicate that I don't want to completely seal it, but instead just insulate the bottom and wall area.  What do you think?  Also, I plan on eventually finishing the basement and using spray foam as insulation.  So anything I do now, I'd want to be able to know that I could remove if needed.

I have two areas of my house which are cantilevered. One is a bay area which extends about 2'. The other is the bottom of a fireplace box (gas fireplace). I have placed two layers of R-13 (I think) insulation in this area, but inside the house it's like a heat sink where all of the heat is sucked out ... very cold to the touch in the winter time. Obviously there must be a better way to insulate this area.  My question is, what is the best way to insulate a cantilevered area so as to allow the inside area of the house to not be so cold in the winter time?


Basically, if we want $\lim_{x\to x_0}f(x)$, why are we 'allowed' to instead find the limit   $\lim_{u\to u_0}f(u)$ where $x = k(u)$, where $k(u)$ is a function in $u$ such that $\lim_{u\to u_0}k(u)= x_0$.   Sorry if this isn't precise enough.. essentially, I want to know why, for example, when we find the limit   $\lim_{x\to 0}f(x)$  we're allowed to instead find the limit  $\lim_{2t\to 0}f(t)$ with $x = 2t$.  I think it's trivial because it's basically 'the same limit', but I'd like to verify that intuition.

So we do a lot of variable substitution in limits at school. Stuff like $\lim\limits_{x\to5}\ (x+1)^2\ =\ \lim\limits_{y\to6}\ y^2$, where we define the substitution $y = x + 1$.  But I've never been clear on what exactly the theoretical basis for this is. What is the formula that you're actually applying when you do variable substitution? What are the formal conditions under which it is possible?  My conjecture would be the following:  For all continuous $f$, and all real $a$: $\lim\limits_{x\to a}\ (f\circ g)(x)\ =\lim\limits_{x\to g(a)}\ f(x)$, where $g$ is a continuous function  So to take my first example, $f$ would be $x^2$, $g$ would be $x + 1$, and $a$ would be $5$.  Am I in the right area? If this is correct, can it be proven using $\epsilon$-$\delta$? I had a half-hearted shot at it the other night and didn't get anywhere.


When I tried Ubuntu 18.04 LTS on my HP envy x360, the touchscreen of the laptop is not working. How can I fix it?

I have a Lenovo Yoga 910-13IKB. I was running Ubuntu 17.10 with no issues. I upgraded to 18.04 LTS and now my right-click on my touchpad does not register. I can only left-click.  I already tried the steps listed , but they did not fix the issue.  Does anyone know how to fix this?  Thanks.


So, here is a table:  \begin{table}[h] \begin{tabular}{llllllll} \rowcolor[HTML]{EFEFEF}  \textbf{foo}            & \textbf{bar}           & \textbf{foobar}        & \textbf{fsj}           & \textbf{jifd}          & \textbf{jifd}          & \textbf{jif}                                                          & \textbf{ifi}                                                          \\ \hline \multicolumn{1}{|l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{\cellcolor[HTML]{FFCCC9}{\color[HTML]{3166FF} 1}} & \multicolumn{1}{l|}{\cellcolor[HTML]{FFCCC9}{\color[HTML]{3166FF} 1}} \\ \hline \multicolumn{1}{|l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{0}                                                & \multicolumn{1}{l|}{1}                                                \\ \hline \multicolumn{1}{|l|}{1} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{\cellcolor[HTML]{FFCCC9}{\color[HTML]{3166FF} 1}} & \multicolumn{1}{l|}{\cellcolor[HTML]{FFCCC9}{\color[HTML]{3166FF} 1}} \\ \hline \multicolumn{1}{|l|}{1} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{\cellcolor[HTML]{FFCCC9}{\color[HTML]{3166FF} 1}} & \multicolumn{1}{l|}{\cellcolor[HTML]{FFCCC9}{\color[HTML]{3166FF} 1}} \\ \hline \multicolumn{1}{|l|}{0} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{\cellcolor[HTML]{FFCCC9}{\color[HTML]{3166FF} 1}} & \multicolumn{1}{l|}{\cellcolor[HTML]{FFCCC9}{\color[HTML]{3166FF} 1}} \\ \hline \multicolumn{1}{|l|}{0} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{0}                                                & \multicolumn{1}{l|}{0}                                                \\ \hline \multicolumn{1}{|l|}{0} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{0}                                                & \multicolumn{1}{l|}{1}                                                \\ \hline \multicolumn{1}{|l|}{0} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{1} & \multicolumn{1}{l|}{0} & \multicolumn{1}{l|}{0}                                                & \multicolumn{1}{l|}{0}                                                \\ \hline \end{tabular} \end{table}   Now I am trying to change the \textbf{foo} (name of first column) to \neg B  But I get the following error: ! Missing $ inserted.                   $ l.55 }

\begin{table}     \begin{tabular}{|c|c|c|c|c|}     \hline     \multicolumn{5}{|c|}{\textbf{Table 1:}Unfiltered Water}\\     Concentration of analyte in sample   & Avg & Std Dev &  RSD & 90\% CI \\      \hline     Total hardness (ppm $CaCo_3$ equiv)  & 97  &    2   &  2\%  & \pm 5   \\     Calcium hardness (ppm $Ca^{2+}$)     & 57  &    3   &  5\%  &  \pm 5   \\     Magnesium hardness( ppm $Mg^{2+}$)   & 40  &    3   & 7.5\% &  \pm 5 \\     \hline     \end{tabular}   This table is giving me an error. That says   ! Missing $ inserted. <inserted text> $ l.41 ...Co_3 equiv\) & 97 & 2 & 2\% & \pm 5 \I've inserted a begin-math/end-math symbol since I think   you left one out. Proceed, with fingers crossed.  What is the cause of this error?  I can't seem to find any thing that is mismatched.


Creating a database that will be searchable using a company's name and then list all the public owners of the company with their phone numbers. And I was wondering how to structure it. I was thinking of making the company name and ID and then make a new table for every company which would then store the information of every stock owner there. But then I thought about what if the owner owned multiple stocks then they would have duplicates in other tables with other companies so that would take a long time to query.   Can anybody help me structure this database? It's my first time doing this.

I'm working on a personal project where I want to make a database that holds the information for every owner of every public company. Say for example "Sears INC" and the program would get the information for every owner in "Sears INC". That is the idea. But I am having a really hard time trying to structure this database. I only have limited experience and knowledge about this subject so any guidance would be greatly appreciated.   Now I was first thinking about making a table called companies, and give them all unique ID's and make a table for every company. Then inside those tables would be all the owners with their unique ID. That would link to their information. I have tried to visualize this here:    Now I know that creating a table for every company would be tedious but I cant think of any other way of doing this. As you all know each company might have the same owner and therefore it would make sense of using Owner_ID to identify each owner.   I have all the other data in a CVS file that I could easily import in PostgreSQL after I have structured the database.  Any help would be greatly appreciated.   TL:DR; Creating a database of stock owners that will be searchable by company name, and need help to structure the database for maximum efficacy.   A person can only have one phone and one address. Same goes for the company, because I have made a script that finds the phone based on this information. The way I differentiate between knowing if a entity is a company or person is by using a column called F_Org which will be larger than 4 digits for companies. This is all handled by the script.


I have a form with a panelGrid, where the user puts in some data:  <h:form>     <p:panelGrid var="workOrder" value="#{WorkOrder}" columns="2"         headerClass="header" footerClass="footer">         <p:outputLabel value="#{msg.project_number}: " for="projectNr" />         <p:column>             <p:inputText id="projectNr"                 value="#{mbWorkOrderController.workOrderCurrent.projectNr}"                 required="true" requiredMessage="#{msg.input_missing}"                 maxlength="6" />         </p:column>         <p:outputLabel value="#{msg.date}: " for="date" />         <p:column>             <p:calendar id="date"                 value="#{mbWorkOrderController.workOrderCurrent.date}"                 mode="popup" navigator="true" showOn="button"                 pattern="dd.MM.yyy" />         </p:column>     </p:panelGrid>     <p:commandButton action="#{mbWorkOrderController.saveWorkOrder()}"         value="#{msg.save}" style="margin-top: 10px" />     <p:commandButton         action="#{mbWorkOrderController.cancelWorkOrder()}"         value="#{msg.cancel}" immediate="true" style="margin-top: 10px" /> </h:form>   When the user clicks "save", the method saveWorkOrder() is called. Inside, I am trying to use the method setWrappedData() on a DataModel variable, after I create the result using the EntityManagerss createNamedQuery():  public String saveWorkOrder() {     try {         utx.begin();         workOrderCurrent = em.merge(workOrderCurrent);         em.persist(workOrderCurrent);         List<WorkOrder> resultList = em.createNamedQuery("SelectWorkOrders").getResultList();         workOrdersList.setWrappedData(resultList);         utx.commit();     } catch (NotSupportedException e) {         e.printStackTrace();     } catch (SystemException e) {         e.printStackTrace();     } catch (SecurityException e) {         e.printStackTrace();     } catch (IllegalStateException e) {         e.printStackTrace();     } catch (RollbackException e) {         e.printStackTrace();     } catch (HeuristicMixedException e) {         e.printStackTrace();     } catch (HeuristicRollbackException e) {         e.printStackTrace();     }     return "rainErosion"; }   Unfortunately I am getting a NullPointerException in setWrappedData(resultList) although resultList contains one element (with the actual user input) and is not pointing to Null, so normaly this shouldn't happen.  Does anyone know, why this happens?

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?


This story begins with a boy and his sister living with their parents in the home of their owner/protector, a large insectoid alien. There is a commotion outside the door, which turns out to be a human male in excruciating pain. As it turns out, the aliens have brought some humans from Earth to their own planet. I don't remember if the humans were the only survivors of a destroyed Earth, or if Earth was still there but oblivious to what the aliens had done. That doesn't matter, anyway, because the humans are there for the purpose of using their bodies as living hosts for the aliens' eggs. The man's owner (not the kids' owner) has neglected her charge's progression, and now the eggs have hatched and are devouring him from within. The kids' owner removes the hatchlings and saves the man's life (but probably not mental health). As a result, the alien feels it necessary to sit the boy down and explain the Birds and Bees to him. She delivers a rather mealymouthed lecture about how she would never neglect them like that, the task at hand is an honor and slaveryaintsobad yaddayaddayadda.... But it's now time for the alien to lay its own eggs, and has been considering the boy's sister for the job of host.  Upon hearing this, the boy volunteers to be the host, in order to spare his sister. There's a terrifying final scene as the alien lays its eggs.  I have at least two anthologies that contain this story. I just can't find either one, or remember the title or (IIRC well-known American) author. This is a story that I could have sworn appeared in one of the legendary New Wave Dangerous Visions anthologies. Much later (late 2000s), I immediately recognized it in a later (single author) anthology. I proposed it as an answer to  a while back, and would have submitted an answer if only I could have remembered the title, or pulled the right book out of a box. And it's been bugging me ever since.

I read this story in a sci-fi paperback magazine probably in the 1970s or 1980s, but it might have been published much earlier.  It begins with a conversation between two young men (brothers?), the older of whom, it eventually transpires, has taken the place of the younger in serving as a host to insect-type creatures.  The insect-types are the main form of life on the planet, and use the human interlopers/colonizers as hosts for the larval stages of their    young. Must have pre-dated the "Alien" movies because when I read it the idea of humans serving as larval hosts was new to me. Don't remember how the story ends -- whether the emergence of the larva kills the human host.


I am using the Deezer app music. It worked well, I could use the media buttons to control play/pause/next track/previous track. But a few days ago, (after an macOS update?) now when I hit play/pause it launches iTunes instead of controlling the Deezer app that is already running and playing music. It was correctly functioning before, so I don't know where this change of behaviour is coming from. This is very annoying as it makes the Deezer almost unusable as I have to bring it to front to control it.

Is it possible to set Spotify as the default program when the "media" keys (play, pause, previous, next, etc) are pressed on the Mac keyboard?   For the most part when Spotify is open, the "media" keys work fine. But every once and a while iTunes will pop up when you hit them. It'd be a lot nicer if you could just specify that Spotify is the default program when these keys are triggered, as oppose to iTunes.  If it matters, I'm using Mountain Lion.


One way to prove that $\{x \mid x^2 \equiv 1 \pmod p\}=\{1, -1\}$ is to use the fact that $\{1, -1\}$ is the only subgroup of the cyclic group of primitive residue classes modulo $p$ that has the order 2. Is there a more basic way to prove this?

The proof is a follows:  Let $p$ be a prime number and $x$ in Z. If $x^2\equiv1\pmod p$ then $x\equiv\pm1\pmod p$.  Proof: By assumption, $p | x^2 - 1 = (x + 1)(x - 1)$. Thus $p | x + 1$ or $p | x - 1$. This completes the proof.    However if $p | x + 1$ then $x$ is congruent to $-1 \mod p$. However why is $p$ congruent to $1 \mod p$ ??   I'm struggling seeing this, and been sitting for some hours now trying to figure it out - please help.


I have my spring boot application, I normally work with wars that I deploy on tomcat, but I want to try this way a little bit more.  My problem is that when I deploy it in a server, and I do   java -jar target/myproject.jar   Works pretty fine, but after a time without use, the shell gets disconnected and soon after it (I believe because the shell) the process stops.  Any idea how to deal with this?  I am using Debian.  Thanks.

I am using Putty to connect to a remote server. What I want to know is if there is any way to write my commands and allow them to keep running after I close the session with Putty. The reason for this is that I do not want to keep the computer ON all the time. Is there any way to do this?.  Update with the solution  For my question as it is presented the best solution is use one of the commands provided such as nohup, because you do not have to install any additional software. But if you are in the same problem use screen, install it and use it. It is amazing.  I have selected the answer of Norman Ramsey as favourite because propose several solutions using commands and screen. But please check the other answers specially the one of PEZ, then you get an insight of what screen is able todo.


I've accidentally installed Ubuntu from a 16.10 iso image instead of 16.04 and I do not want to reinstall it via a format...  Is there a way I can downgrade from 16.10 to 16.04?  PS:   I desire to have an LTS release as to guarantee a certain stability level, would downgrading to 16.04 be a waste of time since 16.10 would allow me such stability, or switching to 16.04 is the logical thing to do?

I just installed a new version of Ubuntu and I want to roll it back to the previous version.  How can I do that? Is that even possible?


I typed following command on my lubuntu terminal from the nodejs download page to install 13.x version : curl -sL  | sudo -E bash - sudo apt-get install -y nodejs  but,when i checked the version of node it was showing me 8.x version.Even i tried to install all  the versions above 10.x ,but still the version was 8.x.Then i tried nvm to change version still the same version. The i tried using npm still the same problem. Actuall the problem is that Angularcli will only work on node versions above 10. Th

How do I install the latest  on Ubuntu? I've been looking around, and I can't find anything. Is there a Ubuntu package for node.js, or do I have to compile it myself?


I had to find two 5-cycles in $A_5$ that are not conjugate. I believe I found two, namely $a=(12345)$ and $b=(21345)$.   It wasn't part of the exercise, but I'd like to prove that they are not conjugate.  But I'm not sure where to start.  I think we have to start with that they are conjugate in $S_5$, so there exists a $g \in S_5$ such that $gag^{-1}=b$. And then prove all the $g's$ for which that is true are $\notin A_5$?  Someone stated this as a duplicate, but I don't think it is, because they don't really ask for/ give the algebraic proof that I'm looking for.

This is a practice question (not assignment). One thing I am wondering is what this question exactly means. From my understanding, the conjugate of $a \in A_5$ is $gag^{-1} \in A_5$ where $g \in A_5$. I was trying to look at a similar question here on MSE and someone mentioned $(12345) \in A_5$ is not conjuagte in $A_5$. So does that means there exists a $g \in A_5$ such that $g(12345)g^{-1} \notin A_5$ (I am guessing this is incorrect since $A_5$ is a group). I am also away of the property that $g(12345)g^{-1} = (g(1)g(2)g(3)g(4)g(5))$.


I'm looking for a list of reliable books/University level textbooks on Investing. All kinds of books from introductory to expert, so that I can become an expert.

I'm completely new to the world of investing and stocks. Knowing that I shouldn't invest or buy stocks until I know it well enough, I was wondering which cheap or affordable resources would be the best to get started?  I've seen quite a lot of books and websites that teach investing, but it's hard to choose.  To narrow it down, what book and/or what website would you recommend that does a good job teaching investing in stocks to beginners?


I think those people who just vilely down-vote a question and go away should receive some penalty on their reputation, because they do not deliver any knowledge to the community. It is a totally non-constructive "hate" position.   For example, I have some question . I am not specialist in physics and in real confusion I just asked to help me find a solution and instead got an anonymous down-vote.   I think such a "hate" behaviour should be punished. What do you think?

Possible Duplicate:    In the spirit of "encouraging" people to leave comments on downvoting, I would propose that if someone downvotes without a comment, I propose a heavy point tax, say 3x the current point cost for a downvote. If he or she downvotes and leaves a comment, then it costs the current amount. If someone leaves a crap comment (to avoid the "charge") they get a painful spank (100 points gone or whatever the community decides) if and only if:  The comment is flagged Three (five? whatever) moderators agree it is crap  Common complaints Or, why my proposal is different.  "  a "   No it isn't. I specifically address the issue of leaving garbage comments to avoid the downvote tax, unlike the other proposals.   "Some people want to leave anonymous (down)votes."  I understand that some might be fearful of retaliation. Is retaliation a real problem or a "what if" conjecture? (Where's the data?) What if we try it for 3-6 months and then circle back to see how well it works?  If a user starts retaliating against another user, they will be dealt with as are all other problem users. Nothing else is anonymous - asking questions, answering questions, editing questions, leaving comments, etc. and there is a clear benefit. What is the benefit to the community for having anonymous voting? I would argue "none." Even though some people might want to leave anonymous questions, answer anonymously or anonymously edit a question, it is not allowed, because it is not good for the community.   "But this will discourage downvoting"  I agree, and I think that's a good thing, which goes to the philosophy of the site: promote good questions and answers. If a question or answer is poor, few will up-vote it. If is is really poor, it will get flagged and . If someone really wants to downvote, no one is stopping him or her. Just as we want quality questions and answers, we need quality voting.   It will require too much work to implement  Maybe. Let's ask if it is worth the effort. What benefit does anonymous, no-comment downvoting add to the site? It certainly doesn't allow the author to improve. What benefit would owned, commented downvoting add? It would hopefully allow authors to improve and discourage drive-by downvoting. Would me (or someone else) submitting a patch alleviate this complaint?   Jeff (or Joel) thinks this is a stupid feature, and you're stupid for suggesting it.  "" Is this a true statement?    Thanks for reading.


My english is not good but i need help please!!! I am adding dynamic rows to a table, within the row inputs used type checkbox. I need to use the onclick event checkbox, but I can't do.   $('#nuevo').click(function() {  //adding a row       var idusu = "<?php echo $idusuariologeado; ?>" ;  var fila='
&nbsp;	'+   '<input name="idiomas_nombre[]" type="text" placeholder="Idioma"    class="form-control input-md"  /><input  name="idiomas_usu[]" type="text"     value="'+ idusu + '" > 	'+    '<input  name="" type="checkbox" value="1" ><input type="hidden"     name="idiomas_suficiencia[]" value="" />	'+     '<input id="cb2"  name="" type="checkbox" onclick="updatebox()"     value="1" /><input type="text" name="idiomas_escritura[]"  />	'+     '<input id="cb3"  name="" type="checkbox" value="1"  >    <input type="hidden" name="idiomas_lectura[]" value="1" />	'+     '<input id="cb4" name="" type="checkbox" value="1" >         <input type="text" name="idiomas_hablado[]" value="1" />
';    //row to table $('#tab_logic').append(fila);       });   the function I intend to use in the onclick  function updatebox() { var textbox = document.getElementById("idiomas_escritura"); var values = [];  if(document.getElementById('cb2').checked) {     values.push("1"); }  if(document.getElementById('cb3').checked) {     values.push("1"); }  if(document.getElementById('cb4').checked) {     values.push("1"); }       textbox.value = values.join(" "); }   Please help me. Thank's

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.


My input file is below INPUT FILE <ReconSummary> <entryName>Total Deep</entryName> 777 <License>L</License> <Tran>H20</Tran> <job>1234</job> </ReconSummary>   <ReconSummary> <entryName>Total Saurav</entryName> 666 <License>L</License> <Tran>H20</Tran> <job>1234</job> </ReconSummary>   <ReconSummary> <entryName>Total Ankur</entryName> 555 <License>L</License> <Tran>H20</Tran> <job>1234</job> </ReconSummary>  I have code which looks like LineNum=`grep -n "Deep" deep.xml | cut -d: -f 1 | awk -F '[\t]' '{$NF = $NF -1;}1'` sed -i "/$LineNum/s/^/

I have an input xml file like below INPUT FILE <ReconSummary> <entryName>Total Deep</entryName> 777 <License>L</License> <Tran>H20</Tran> <job>1234</job> </ReconSummary>   <ReconSummary> <entryName>Total Saurav</entryName> 666 <License>L</License> <Tran>H20</Tran> <job>1234</job> </ReconSummary>   <ReconSummary> <entryName>Total Ankur</entryName> 555 <License>L</License> <Tran>H20</Tran> <job>1234</job> </ReconSummary>  I want to comment the tag if i find the pattern "Total Deep" so that the output file looks like below OUTPUT    <ReconSummary> <entryName>Total Saurav</entryName> 666 <License>L</License> <Tran>H20</Tran> <job>1234</job> </ReconSummary>   <ReconSummary> <entryName>Total Ankur</entryName> 555 <License>L</License> <Tran>H20</Tran> <job>1234</job> </ReconSummary>  Since i am new to shell scripting, can anyone help me out as to how i can apply this with the help of shell scripting?


Which of the following is correct:    ... where c is a constant, f(.) is a monotonic function, x and y are random variable.  ... where c is a constant, f(.) is a monotonic function and x and y are random variable.    This always gets me confused. Because x and y are of one kind (I don’t know if that is the proper word) and there should be an ‘and’ in between, but I’m not about whether not I should write an ‘and’ before the phrase too because it is the last item in a list (I mean it’s like saying: I bought apples, oranges, and bananas.).

For example,      I like chocolate, vanilla, and lemon and orange ice cream.    Indicating "lemon and orange" is a combined flavor, as an item in the list needing an initial and.


This question has been closed as a duplicate because it has an answer elsewhere, but anyone who wishes to write a new answer is most welcome to post it under the original question, possibly referencing this question in your new answer to avoid any confusion.  I have heard some people insult others explicitly with the rider "I would never call" which is a meaningless denial in context because the person is effectively calling them that right then and there, as in  I would never call you a dull, idiotic bigot... I would never call my learned opponent fat, ugly and ignorant...  Alternate form kindly reminded by @Fattie in a :  "Many people have said she is XZY [insult] - but of course I'd never say that!"  This is often heard in a political context but also in personal interactions. Is there a word or phrase to describe this? Phrases I have considered and rejected: It is not a  insult or a  because the insult is not veiled/ qualified but explicit, and it is not a  because it is not a mitigated compliment or an insult with potential to carry a compliment, but is an outright, unmitigated insult. Update: Thanks to @Edwin Ashworth for marking as duplicate and pointing to the earlier question: of those 4 answers the word  seems very appropriate for this context based on the insulting political examples provided in the article linked:

This seems to me to be a kind of rhetorical figure, but I cannot find a classical term for it in . Examples include the following from Tristram Shandy (Vol. 2 Chap. 24):     I define a nose, as follows,—intreating only beforehand, and beseeching my readers, both male and female, of what age, complexion, and condition soever, for the love of God and their own souls, to guard against the temptations and suggestions of the devil, and suffer him by no art or wile to put any other ideas into their minds, than what I put into my definition.—For by the word Nose, throughout all this long chapter of noses, and in every other part of my work, where the word Nose occurs,—I declare, by that word I mean a Nose, and nothing more, or less.   This of course makes it quite impossible not to read nose in the book as also referring to penis.   Another example is an advertisement for Joyce’s Ulysses in America, citing the 1933 decision of the United States District Court for the Southern District of New York that the book was not obscene—which advertisement boils down to “Hey, Buddy, wanna buy a dirty book?”   Yet another is the line “this is not an offer of prostitution” on Web sites, which is an almost infallible indicator that the exact opposite is the case. (For a g-rated account of the use of this line, see .)   And finally, though it is perhaps not quite exactly the same thing, I would point to the classic device of humorous fiction—dating back all the way back to Cervantes and also seen in Mark Twain and Jerome K. Jerome—of insisting that it is not fiction but rather literal truth, which insistence goes on safely within the fictional compact by which readers agree to be entertainingly lied to.  What can we call this figure? Simply terming such usage facetious or disingenuous seems to fall short of designating such flat opposition between the literal and the intentionally conveyed meaning.


Wondering, at a high level, what is the logic around the human verification interstitial that appears some times when submitting a new question?  I am asking because I am working on a similar system for a site I am working on, and it just happened to me when posting on the UX site (of which i am a member and have posted a number of questions and answers in the past)

Really just looking for honest answers from fellow users for this one.   How often do you get CAPTCHAs, and what were you doing when it appeared?  Some future scripts I'm working on may attempt actions that could at times require a CAPTCHA, which would throw a big wrench into the gears. I'm just trying to figure out when I can expect to see them, and when I can expect to avoid them.   I myself have only had to answer a CAPTCHA once, and it was on my first post ever.


Consider $\mathbb{Z}[\sqrt{10}] = \{x + \sqrt{10}y; x,y \in \mathbb{Z} \}$.  We want to show that there is no uniqueness of factorisation.  I think that it's better to consider $9 = 3 \cdot 3 = (\sqrt{10}-1)(\sqrt{10}+1)$. But now we need to show that $3$ and $\sqrt{10}-1$ are irreducibles in this ring.  There is a problem with this. My attempt : let's say $3 = (a+\sqrt{10}b)(c+\sqrt{10}d) = \sqrt{10}(ad + bc) + (ac +10bd)$, now we have that   $ad + bc = 0$ , hence $3 = (a-\sqrt{10}b)(c-\sqrt{10}d)$ is appropriate too. So we have that $9 = (a^2 - 10 b^2)(c^2 - 10d^3)$ which give us 4 possibilities : $9 = 1 \cdot 9 = (-1)\cdot(-9) = 3 \cdot 3 = (-3) \cdot (-3)$. It's easy to see that the las two cases are invalid.  But what about first scenario. There will be some solutions for $a^2 - 10b^2 = 1$ and $c^2 - 10d^2 = 9$, but how can I show that these solutions doesn't hold equation $ad + bc = 0$? Any hints?

I am wondering how to show that $\mathbb{Z}[\sqrt {10}]$ is not a UFD.    My only idea is to show that there are two factorizations of $10$, say, $ab, uv$ such that $a$ is not a unit times $u$ or $v$. In this ring $10=2\cdot5=\sqrt {10}\cdot \sqrt {10}$, so it suffices to show $2$ is not a unit times $\sqrt {10}$. Suppose $2=\sqrt {10}(a+b\sqrt{10})=a\sqrt{10}+10b$. Then $a=0$ since $\sqrt{10}$ is not rational. So $10b=2$, which has no integer solutions. So $\mathbb{Z}[\sqrt {10}]$ is not a UFD.  Is my reasoning correct? What are the flaws?


Yesterday my game was reset and when I tried to load again it does not let me load with google. When It says sign in with google and you click there the Pokéball keeps spinning over and over and never ends!!  I saw a related question on Arqade, but the answer didn't help me: on my mobile When I go to settings then account and google there is no sign in and security option.

Pokemon GO isn't working at all for me right now. I'm in one of the following circumstances and can't do anything:   My game is displaying a "Try Again" message I'm stuck on the Loading Screen When I sign in I get a message that the servers are experiencing problems. I see the map but nothing is loaded, and my team color is wrong The "loading" Pokeball just ends up spinning and I can't catch or interact with things When I try to catch a Pokemon, the Pokeball just sits on my screen doing nothing Gym opponents will drop to 1 HP and won't take any more damage or attack When I open a pokestop, the pokestop image and the name of the pokestop does not load.   What's causing this? Is there a way to fix it?


Let $\rho,V$ be a representation of $S_3$.   In my lecture notes, It says that we can deduce the characters of $V\otimes V$ and $\operatorname{Sym}^2(V)$ and $\bigwedge^2V$ only from the character table of $S_3$.  I don't see how for the symmetric and exterior algebras, as those are quotients and I am not aware of operations on character of quotient representations.   Thank you for your hints or help.  Edit  Trying to do the exercise pointed out by @darij in Alex's Answer.  Let $G=S_3=\{\sigma, \tau|\sigma^2=\tau^3=\sigma\tau\sigma\tau=e\}$.  Taking the notations of the other   We have $m=2$ and $g=\tau$ and we try to find $\chi_{Sym^2(V)}$.  Let $1,j,j^2$ be eigenvalues of $\tau$ and $1, -1$ those of $\sigma$. I don't understand the step 2. How do we get $\chi_{Sym^2(V)}$ in terms of the eigenvalues?  Thank you.

Let $V$ be a representation with character $\chi$.  I would like to have a formula for the characters of the representations $\mathrm{Sym}^m[V]$ and $\wedge ^m[V]$ in terms of $\chi$.  Fulton and Harris presents such a formula for $m=2$, but not for general $m$.  Is there a "nice" such expression?  I found a paper by , but this doesn't seem to be what I'm looking for (it doesn't seem to give a general formula in terms of $\chi$).  In case the link does not work, here is the reference:  X. Zhou, P. Pulay. Characters for Symmetric and Antisymmetric Higher Powers of Representations: Application to  the  Number of Anharmonic Force Constants in Symmetrical Molecules. Journal of Computational Chemistry, Vol 10, Issue 7, (1989).


I got some minor damage(torn marks) to back side cover due to accidental spilling of glue stick. The last cover page got stick to its previous page. When I try to separate them it got torn a bit. Is this acceptable for travel or can I better go for a re-issue of passport ? Except this there is no other visual or physical damage.

Hi All, My passport first page got ripped. Front side of this page has a Indian emblem and backside is a blank with no stamps or Visas. Other pages including visas, personal details, POE stamps everything looks good. Basically a brand new passport with more than 7 years validity. Will this be considered as damaged? Please help me with your answers ASAP as I have a travel plan to India end of this month for my own wedding.   This damage happened accidentally when I was scanning the pages.


Why do some people say or write an historical but not an ham sandwich or an hint?

A basic grammar rule is to use an instead of a before a vowel sound. Given that historic is not pronounced with a silent h, I use “a historic”. Is this correct? What about heroic? Should be “It was a heroic act” or “It was an heroic act”?  I remember reading somewhere that the h is sometimes silent, in which case it’s an, and when the h is pronounced, it’s a. But then I also remember reading that it depends on which syllable is stressed. And I also think I read somewhere that it might differ between British and American English.  Personally, I pronounce the h, and believe that a is correct. I find that it sounds incorrect to use an and pronounce heroic without the h.  So how do I know when to use a and when to use an with a word beginning with the letter h? Are both acceptable or is there one that is correct?


In English class today, I wrote the following sentence:      If Susan had told Tom the truth, he would not be so angry.   It seems to me that "so angry" is not really the best way of saying it. Is "as angry as he is" better? Or do you have any other suggesting?

I just googled the difference between as long as and so long as. The difference has alredy been discussed . There are, it seems, two contexts for these expressions:    lengths and physical comparisons (time, distance, etc.) “This bridge is as long as that bridge.” some logical implication or synonym for provided that or something like this.  “You can do that so long as you keep in mind that. . . .”   Somewhere else I found that you can use both expressions for context #2, but should avoid so long as in cases of context #1.  Now,  that so long as might be colloquial — or as he put it, “casual”. It seems that it’s possible to never use so long as, since according to what I have been told, you can use either expression in cases of context #1. Given that I am writing academic papers, my questions are:    Is so long as truly non-academic or non–high-style? Should so long as therefore be avoided altogether?


I also just bought a TV worth $1400 with a best buy credit card. I only want to pay for the TV and never use this card again. Can someone tell me what I should do after I pay for my TV? How will not using this card affect my credit score?

I was young and stupid and opened up a Best Buy credit card 5 years ago. I bought a new laptop and also a lot more stuff during these 5 years. I have bought over 10,000 dollars worth of stuff and paid it all off today. The interest rate on the card is 24.something percent.   Due to personal financial reasons, I was not able to take advantage of low rate offers from Best Buy on stuff I bought on the card and ended up paying a whole bunch of money as interest.   I want to close this credit card for several reasons:   It doesn't have a Mastercard/Visa/etc logo on it so I can only use it at Best Buy. The interest rate is ridiculously high. I spend more money because I get enticed into offers that come with this card. But I do not want to spend any more money than I can afford. I will have to pay annual maintenance fee even if I don't use this card.   My question is, if I close this card which has a 4000 dollar credit limit on it, will it affect my credit score or credit history? Does it make sense for me to keep it open or just close it permanently? Will my total credit limit go down as a result as this card is not offered by a major credit card provider?


Recently I was asking a question on the Stack Exchange network and received a very brief description of how to handle my issue.  Unfortunately the answer didn't have any citations or examples. As such, I took the liberty of modifying the author's post to include citations and an example which did exactly what the author had said.  In my mind I was "clarifying the meaning without changing it", "adding related resources or links", "". Was I wrong?  Based on additional discussion I was told to add the additional information to the comments, but this seems to act opposite to "". When I bring up these well defined suggestions for what edit's are for, the users do not answer clearly what I could've done better outside of creating a duplicate answer with my additional information.  Please clearly define when links/resources should be added to an existing answer versus when a duplicate answer should be created.

Similar to '', is it also ok to add an example?   I was going to  but I noticed that one answer had most of the things I needed to say, except perhaps that the questioner didn't perhaps understand the answer and  I feel that an example may help.


My husband thought that he was co-signing for his son's car.  It turns out that they made my husband the primary loan holder but the dealership only put his son's name on the title.   His son is now in legal trouble and he will be unable to make the payments. We are now responsible for the loan on a car that we can't drive.  Is this legal?  I am not asking about the difference between primary and co-signer. I was asking if anyone knew if the dealership has a legal obligation to put the primary loan holder on the title because in Ohio only the owner of a vehicle can purchase the yearly tags. I am fully aware that the loan is our responsibility. I

My daughter asked me to cosign on a car loan.  Somehow I ended up as the borrower and she a the cosigner.  Is that legal?


I need to prove that the set $\{ x \,| x \in P \text{ and } x \in Q \}  $ exists. Now, I am thinking of . This axiom states that $$ \forall w_1,\cdots, w_n \, \forall A \,\exists B \,\forall x \left( x \in B \Longleftrightarrow [ x \in A \wedge \varphi(x,w_1, \cdots , w_n, A)] \right) $$ Now, I will define predicate $\varphi(x, P, Q) = x \in P \text{ and } x \in Q $. Also, I will let $A = P$ and  $w_1 = Q $. So using universal instantiation, I get the following $$ \exists B \,\forall x \left( x \in B \Longleftrightarrow [ x \in P \wedge \varphi(x, P, Q)] \right) $$ And using, existential instantiation, there exists a set $B$ such that $$ \forall x \left( x \in B \Longleftrightarrow [ x \in P \wedge \varphi(x, P, Q)] \right) $$ Now, using , it follows that $$ B = [ x \in P \wedge \varphi(x, P, Q)] $$ So, does this mean that $ B = \{ x \,| x \in P \text{ and } x \in Q \}  $ ?

I have to show that set of all $x$ such that $x \in P$ and $x \notin Q$ exists. So, I think I have to assume that sets $P$ and $Q$ already exist. So, with that, I can use  . This axiom is $$ \forall w_1,\cdots, w_n \, \forall A \,\exists B \,\forall x \left( x \in B \Longleftrightarrow [ x \in A \wedge \varphi(x,w_1, \cdots , w_n, A)] \right) $$ So, I will let $\varphi(x, Q, P) = x \in P \text{ and } x \notin Q $. Also, I will let $A = P$ and  $w_1 = Q $. So using universal instantiation, I get the following $$ \exists B \,\forall x \left( x \in B \Longleftrightarrow [ x \in P \wedge \varphi(x, Q, P)] \right) $$ And using, existential instantiation, there exists a set $B$ such that $$ \forall x \left( x \in B \Longleftrightarrow [ x \in P \wedge \varphi(x, Q, P)] \right) $$ Using the definition of $\varphi(x, Q, P)$, this can be simplified as following $$ \forall x \left( x \in B \Longleftrightarrow [ x \in P \wedge x \in P \wedge x \notin Q] \right) $$ $$ \forall x \left( x \in B \Longleftrightarrow [ x \in P \wedge x \notin Q] \right)$$ $$ \forall x \left( x \in B \Longleftrightarrow x \in \{ x \,| x \in P \text{ and } x \notin Q \} \right)$$ Now, using , it will follow that $$ B = \{ x \,| x \in P \text{ and } x \notin Q \}  $$ And, since $B$ exists, this means that $\{ x \,| x \in P \text{ and } x \notin Q \} $ also exists. Is the proof good ?


I have some code where I want to pull code from the database where the date matches the date that the user selected. The column on the SQL server end is a Date parameter. Below is my code where I try to SELECT a record where the user imputed date matched the date in the record on the database. However I am getting error every time I get tot he $stmt = $dbh->query($sql) line i get the error call back.  I have tried echoing $sql from the below line of code  $sql = "SELECT * FROM tblEmployee WHERE  dtDate = " . $selected_date;   and on sql server I get  "Operand type clash: date is incompatible with int". Below is my code  if(isset($_POST['submit'])){             try{                 $dbh = new PDO('sghf','','');                  $dbh->setAttribute ( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );                  $selected_date = date('Y-m-d', strtotime($_POST['dateFrom']));                 $selected_option= $_POST['iChoiceID'];                 $returnVals = array ();                  $sql = "SELECT * FROM tblEmployee WHERE  dtServed = " . $selected_date;                 //echo $sql;                $stmt = $dbh->query($sql);                  //$sourceInfo = $stmt->fetch( PDO::FETCH_ASSOC);                 /*                 $returnVals['info'] = array();                 $returnVals['info'] ['txtInfo'] = $sourceInfo ['txtInfo'];                 $returnVals['info'] ['txtName'] = $sourceInfo ['txtName'];                 $returnVals['info'] ['txtOther'] = $sourceInfo ['txtOther'];                 $stmt->closedCursor();                 */               }catch ( PDOException $e ) {                 echo "error";     }   I would just like to know if there is a way of verifying they are the same type.  Thanks in advance

If user input is inserted without modification into an SQL query, then the application becomes vulnerable to , like in the following example:  $unsafe_variable = $_POST['user_input'];   mysql_query("INSERT INTO `table` (`column`) VALUES ('$unsafe_variable')");   That's because the user can input something like value'); DROP TABLE table;--, and the query becomes:  INSERT INTO `table` (`column`) VALUES('value'); DROP TABLE table;--')   What can be done to prevent this from happening?


I can't do anything. Whenever I use "sudo", I receive "sorry, try again". I need to install gcc. Can anyone help me?  To run a command as administrator (user "root") use root "sudo <command>". See "man sudo_root" for details.  zyl@zyl-HP-348-G4:~$ sudo apt install gcc [sudo] password for zyl:  Sorry, try again. [sudo] password for zyl:  Sorry, try again. [sudo] password for zyl:  sudo: 3 incorrect password attempts zyl@zyl-HP-348-G4:~$

I'm working on a Ubuntu system, and my client has completely forgotten his administrative password. He doesn't even remember entering one; however it is there.  I've tried the suggestions on the website, and I have been unsuccessful in deleting the password so that I can download applets required for running some files. Is there a solution?


I have a spreadsheet has one column as the following:              column A     1                  a 2                  b 3                  c 4                  d 5                  e   I want to save this spreadsheet and transpose the column by row as the following:  ID   column A column B column C column D column E 1           a        b        c        d        e   How can I do that?

I have a file with the lines like below.  title1:A1 title2:A2 title3:A3 title4:A4 title5:A5  title1:B1 title2:B2 title3:B3 title4:B4 title5:B5  title1:C1 title2:C2 title3:C3 title4:C4 title5:C5  title1:D1 title2:D2 title3:D3 title4:D4 title5:D5  How can I achieve this?   title1    title2     title3    title4 A1         A2         A3         A4 B1         B2         B3         B4 C1         C2         C3         C4 D1         D2         D3         D4


Could anyone help me with that? I get the error stated with the following code:    if (actualStep.getChanged() == null) {         notificationCombo.setItems(FXCollections.observableArrayList("There are no new changes."));         notification.setImage(notificationBLUE);     }   I get a Nullpointer when compiling as the boolean is not inizalized.

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?


I have problem when answering or asking questions on StackOverflow  Suppose I have two possible code snippets and I want to ask which is better.  Here is code 1:  @Override     protected void onCreate(Bundle savedInstanceState) { // my code here     }   and here is code 2:      @Override     public boolean onCreateOptionsMenu(Menu menu) {         // my code here          }   You may notice that I can put the code in code snippet block But this is not possible if I add Bulleted list just before this code snippet, Like this:   Here is code 1  @Override             protected void onCreate(Bundle savedInstanceState) {         // my code here             } Here is code 2  @Override         public boolean onCreateOptionsMenu(Menu menu) {     // my code here     }   Now, no matter what I try I cannot format my code in code snippet form, even without the short cut ctrl + k.  You can even check and try to edit this question attempting to put the code in code snippet.  Moreover if I have say 30 line of code, the ctrl + K destroys the formatting of code instead of putting in code snippet.  It literally means that if have bulleted list as your first statement in your question/answer you cannot add code snippet.  So,    Is this a known bug? Is there any alternative to put code in code snippet. If yes, then how?

Consider the following piece of Markdown code:  This is some regular text.      >>> def factorial(n):     ...     return 1 if n < 2 else n * factorial(n - 1)     ...   * This is a list item.      >>> def factorial(n):     ...     return 1 if n < 2 else n * factorial(n - 1)     ...    Notice that the second code block is preceded by a list item.   Why is the factorial code not properly formatted under these circumstances? To demonstrate the problem, I'll insert the Markdown code show above:    This is some regular text.  >>> def factorial(n): ...     return 1 if n < 2 else n * factorial(n - 1) ...     This is a list item                 def factorial(n):       ...     return 1 if n < 2 else n * factorial(n - 1)       ...               This applies to numbered as well as unnumbered lists.


And what is the optimal method to do this? Is there a package for this in R?

I'm wondering what the value is in taking a continuous predictor variable and breaking it up (e.g., into quintiles), before using it in a model.   It seems to me that by binning the variable we lose information.   Is this just so we can model non-linear effects?  If we kept the variable continuous and it wasn't really a straight linear relationship would we need to come up with some kind of curve to best fit the data?


I've looked at this thread already:   However, I've tried it and it doesn't seem to turn of mouse acceleration. I have already tried to change 'bMouseAcceleration' to equal 0. I've also tried entering in iPresentInteval=0 to turn off VSync or something... Do I need to somehow refresh Skyrim on Steam or something? I didn't change the name of the file, for anyone who's wondering. Thanks in advance.  Also, if this helps, I have an MSI GE62 6QD with: 16 GB ram i7-6700HQ @ 2.60 GHz Nvidia GTX960m 2 GB  P.S. I know it isn't working because the mouse cursor does not follow the in-game cursor, and it still feels "floaty".

Mouse acceleration seems to be on by default, and I can't find anywhere in the launcher settings or the in game settings to turn it off.  It's very annoying as it makes it feel as if the mouse is lagging. Is there any way to turn it off?


Earlier today I set up a self-hosted website using Ghost. Everything went fine and the site loaded. However, after restarting, I am now encountering ERR_CONNECTION_REFUSED when I visit the website URL. I have ran ghost start, followed by ghost ls. This produces the following:   │ Name   │ Location               │ Version │ Status               │ URL            │ Port │ Process Manager │  │ mysite │ /mnt/raid1/nginx/ghost │ 3.13.3  │ running (production) │ https://mysite │ 2368 │ systemd  I've no idea what I need to do to get my site back online. I've tried restarting ghost and it produces the same running (production).  If I can provide additional details, please ask. I'm a complete novice. Thanks!

This is a  about Connection Refused    We see a lot of questions to the effect      When I try to connect to a system I get a message      Connection refused      Why is this ?


If $ \ \ \large \sum_{n=0}^{\infty} \frac{1}{n+1} \binom{2n}{n} x^n= \frac{1-\sqrt{1-4x}}{2x} \ $ , then show that $ \ \sum_{n=0}^{\infty} \binom{2n}{n}x^n = \frac{1}{\sqrt{1-4x}} \ $ .   Answer:  I have no idea  how to start this type of  .   Any idea ?

I need to find the values of $a$ and $n$ in the following  $$ (1 + ax)^n  = \sum_{i=0}^\infty \binom{2i}{i}x^i$$  How can I compare things and show that $a=-4$ and $n = -{1 \over 2}$. It's easy to expand $1 \over \sqrt{1 -4x}$ see that it's valid but I'm looking other way around.


I want to load a page and, after the body tag, execute a sort based on localStorage. But myWay (no pun intended) doesn't work. Can you help me?  I have 3 sort functions, each with one of these lines:  <script>  localStorage.setItem("current_sort", "classSort()"); localStorage.setItem("current_sort", "playerSort()"); localStorage.setItem("current_sort", "ratingSort()");  </script>  <script>  myWay = localStorage.getItem("current_sort");  if (myWay === "") {myWay = "playerSort()";}  </script>   How do I load myway?   <script> eval (myway()); //doesn't seem to work. </script>

I have the name of a function in JavaScript as a string. How do I convert that into a function pointer so I can call it later?  Depending on the circumstances, I may need to pass various arguments into the method too.  Some of the functions may take the form of namespace.namespace.function(args[...]).


Problem  Finding the last two digits of a base with a large exponent: $237^{222222212202}$.  Method   If the number ends on 1:   the the second last digit is the second last base digit times the last exponent digit the last digit is 1  If the number ends on odd:   rewrite it until it is a number that ends on one and the first rule can be used $((n^4)^{e/4})$  If the number ends on an even number:   $..76^{n} = ..76$ $..24^{n} = $ ..76 for even $n$ and 24 for uneven $n$ $..2^{10} = ..24$    Solution  $$(7^4)^{55555553050}\cdot 7^2 = (2401)^{..0} \cdot 7^2 = ..01 \cdot 7^2 = 49$$  Question   Is this method correct / could it be improved? Is there an easier method? Can someone please take my example and demonstrate it with Euler and explain it?   Thank you so much!

I am doing this problem mentioned above and I know the answer because I know Euler's Theorem that $$a^{\varphi{(m)}}\equiv{1}\pmod{m}.$$  I used 100 as my modulus and got that the last two digits of $7^{355}$ are $43$.  My question is this.  What prime should I pick to solve this problem using Fermat's theorem $$a^{p-1}\equiv{1}\pmod{p}$$  As a precursor problem, the author (Dudley; Elementary Number Theory) asked to find the last digit of the number above; so using a modulus $5$, $7^4\equiv{1}\pmod{5}$ by Fermat.  Since the answer is $7^{355}\equiv{3}\pmod{5}$, the last digit is either $3$ or $8$.  Since $7$ is odd, the answer will clearly be odd, so $3$ is it.  The book is working linearly, building from the previous chapters and Euler's Theorem isn't mentioned for another two chapters (I remembered Euler from a problem solving class in college).    So again, what prime would be best?  How should I procede?    EDIT: I've seen a bunch of problems on the site and none that I looked at did it using Fermat.  If there is one, that could be posted and I would be happy.  EDIT 2:  it seems that the problem of finding of finding the last two digits using is rather difficult because of the implication that we need something mod 100.  Is there a way around this , like adding a step or complexifying, in order to finish the problem with Fermat?


I would like to add a warning in my log when using the \todo command. To do so i did:  \documentclass{book}  \usepackage[colorinlistoftodos,prependcaption,textsize=tiny]{todonotes}  \let\oldtodo\todo \renewcommand{\todo}[2]{\oldtodo[#1]{#2} \message{Warning: TODO: #2.^^J}}  \begin{document}  \todo{}{Maybe write something meaningful} Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.  \end{document}   and everything is fine. However, if i change the renew line in:  \renewcommand{\todo}[2][inline]{\oldtodo[#1]{#2} \message{Warning: TODO: #2.^^J}}   I receive the error  ! TeX capacity exceeded, sorry [input stack size=5000].

Frequently I see users redefine macros using (for example)  \let\oldmacro\macro% Store \macro in \oldmacro \renewcommand{\macro}{%   % ...redefined \macro   \oldmacro% }   and other times they use  \usepackage{letltxmacro}% http://ctan.org/pkg/letltxmacro \LetLtxMacro{\oldmacro}{\macro}% Store \macro in \oldmacro \renewcommand{\macro}{%    % ...redefined \macro   \oldmacro% }   Why would one use \LetLtxMacro when \let works just as well? Or, more specifically, when would one use \LetLtxMacro and/or why?


I have the following quadratic equation: $$(1-i)x^2 +ix - \frac{1}{4}i = 0$$ when I tried to solve for $x$ and get the complex solutions I got $ \sqrt{i}$ in the determinant. I know that $$ i^2 = -1 \implies \sqrt{i} = (-1) ^{\frac{1}{4}}$$ but don't come any further with it. Thanks in advance for your help

Where $i$ is the square root of negative one.  And is there a generalization of the $n$th root of $i$? Also how would this look graphically on the real number axis? Thanks


I am a 16 year old student who will be learning Physics next year. Before I actually start Physics in school, however, I want to have a basic or intermediate understanding of the subject beforehand. This is because I'm really interested in this type of science and I want to to impress my science teacher. I'm hoping to be borrowing some books relating to Physics in the oncoming weeks to help me learn.   Are there any resources online, Physics books, or exercises you guys can recommend to me? Also, are there certain terms or parts of Physics that I should start off with? (eg: the study of relativity)

Every once in a while, we get a question asking for a book or other educational reference on a particular topic at a particular level. This is a meta-question that collects all those links together. If you're looking for book recommendations, this is probably the place to start.  All the questions linked below, as well as others which deal with more specialized books, can be found under the tag  (formerly ).  If you have a question to add, please edit it in. However, make sure of a few things first:   The question should be tagged  It should be of the form "What are good books to learn/study [subject] at [level]?" It shouldn't duplicate a topic and level that's already on the list   Related Meta:


I've trying to read up on the evidential merit of general relativity and am rather curious as well as skeptical of early as well of possibly later more rigorous measurements of light (electromagnetic signals) bending around the bodies in our solar system. In all situations, but especially around the sun, how have we accounted for errors invoked by purely classical (or quantum) light refraction in the atmosphere of the sun (planets or space) which would affect electromagnetic signals being sent/received or see light from distant stars. I would love it if someone did some calculations on what we would expect the deflection to be purely from refraction and then what we expect from GTR then what was experimentally measured. Thank you for your consideration.

My current understanding of gravitational lensing follows  When a star or other massive body passes between us and another star, the phenomenon generally labeled 'gravitational lensing' occurs.  The term 'gravitational lensing' refers to the bending of light rays due to the gravitational influence of the massive body.  Since the bends concentrate light for the observer, they act like a magnifying lens.  OTOH  But since I was young I have pondered other explanations for such observations.  One thought about what (else) might cause the observed effect is a cloud of gas around the massive body itself.  The assumption being that any change in density between the thin gas of interstellar space and the thicker gas surrounding a massive object should form a refractive boundary.  In the case of an active star, that gas & might be the heliosphere of the star, and for any massive object that is not creating an  heliosphere, it could be due to clouds of gas that the massive object is sucking in.  I raised this idea with a physics teacher in high school & he assured me that any possible refraction from clouds of gas had been ruled out in observations of gravitational lensing.  I never got to see papers on the subject, so I cannot confirm that (and am not convinced).  My questions are:   Does anybody know of papers on gravitational lensing that discuss the refraction from clouds of gas around the lensing body? How could an observer/experimenter go about quantifying the likely refractive index of such a gas cloud.


I want to be able to resize a div using resize feature in css. In my .css file I have:  #test {     border: 2px solid;     padding: 20px;     width: 300px;     resize: both;     overflow: auto; }   My div is the following:
Let the user resize both the height and the width of this div element.
   It works fine until I put my html in an iframe, there I can't resize the div. What's wrong?  PS: I dont' want to use jquery

I have a simple page that has some iframe sections (to display RSS links). How can I apply the same CSS format from the main page to the page displayed in the iframe?


I'm confused by the phrasing I've seen about exponential families.  What does it mean to say "an" exponential family.  Why not "the" exponential family?  From a pdf from Berkely: "we define an exponential family of probability distributions as those distributions..."  From Statistical Inference (George Casella, Roger L. Berger): "Let $X_1, X_2, ..., X_n$ be iid observations from a pdf $f(x|\theta)$ that belongs to an exponential family..."  I've also ready things that say, "this distribution belongs to an exponential family..."  But what are the different exponential families? Why not just say the exponential family? If there are multiple exponential families, why haven't I ever seen something like, "the binomial distribution belongs to exponential family A, while this other distribution belongs to family B..."?   I've searched around, and can't find a list of these families. How can there be an exponential family if there are not more than one of them?

I am reading the book:     Bishop, Pattern Recognition and Machine Learning (2006)   which defines the exponential family as distributions of the form (Eq. 2.194): $$ p(\mathbf x|\boldsymbol \eta) = h(\mathbf x) g(\boldsymbol \eta) \exp \{\boldsymbol \eta^\mathrm T \mathbf u(\mathbf x)\} $$ But I see no restrictions placed on $h(\mathbf x)$ or $\mathbf u(\mathbf x)$. Doesn't this mean that any distribution can be put in this form, by appropriate choice of $h(\mathbf x)$ and $\mathbf u(\mathbf x)$ (in fact only one of them has to be chosen properly!)? So how come the exponential family does not include all probability distributions? What am I missing?  Finally, a more particular question that I am interested in is this: Is the Bernoulli distribution in the exponential family?  claims it is, but since I am obviously confused about something here, I would like to see why.


how can I find sum of series $ \sum_{n=1}^{\infty} (n\cdot \ln \frac{2n+1}{2n-1} - 1) $? It is so weird for me because I put this to Mathematica and it tells me that sum does not converge...  Let consider sum no to infinity, but to n  $$ \sum_{k=1}^{n} (k\cdot \ln \frac{2k+1}{2k-1} - 1) =$$ $$ ln \frac{3}{1}\cdot \left(\frac{5}{3}\right)^2 \cdot...\cdot \left(\frac{2n+1}{2n-1}\right)^n - n = ln \frac{1}{1}\cdot \frac{1}{3}\cdot \frac{1}{5}\cdot ... \frac{1}{2n-1} - n $$ but $$ n = ln e^n $$ so it will be $$ln\frac{1}{e^n} \cdot \frac{1}{1}\cdot \frac{1}{3}\cdot \frac{1}{5}\cdot ... \frac{1}{2n-1}$$  So the limit of it is $-\infty$ Have I done this well or I missed sth?

Does anybody know how to prove this series?  $$\sum_{n=1}^{\infty} \left( n\log \left(\frac{2n+1}{2n-1}\right)-1\right) = \frac{1-\log 2}{2}$$  I arrived at this through Mathematica.  I tried writing $\log \left(\frac{2n+1}{2n-1}\right)$ as $\int_0^1 \frac{1}{\frac{2n-1}{2}+x}dx$ and $-\sum_{k=1}^\infty \frac{(-2)^k}{k(2n-1)^k}$ but none of them worked.


The @ Symbol is very common in Batch Scripts. Comments section mistakenly interprets it as an @reply comment. Here in this example Comment section thinks I'm referencing a user named @echo The image below shows what I mean.  My Current work-around is to place @echo off in double quotes. However that also leads to confusions sometime. Is there any solution other than not referencing @User or putting the code starting with @ in double quotes?

How can I put the @ sign in a comment without referring to a person?   I want to have six @ characters in a comment (ruby on rails variables), but when I try to do this, I'm getting an error about being unable to notify that many people in a single comment.  It seems that the workaround &#64; is not being replaced with an @ sign, either.


Part of the fun of hats is not just earning them, but wearing them (preferably in ). I particularly appreciated the addition of size/position/rotation controls a few years ago.  Would it ever be possible to have my avatar wear multiple hats? e.g....   oh no, I have set myself on fire trying to light the menorah

I earned two hats on a site, and I think it would be great if we can wear both at the same time.  Can this please be made possible?


I am working on mobile app development. I am uploading image in base64 string format. i want image name and image size from base64 image string.  $("body").append("<img id='hiddenImage' src='" + "data:image/jpeg;base64," + imageData + "' />"); var file_size = $('#hiddenImage').size(); alert(file_size); var width = $('#hiddenImage').width(); var height = $('#hiddenImage').height(); $('#hiddenImage').remove(); alert("width:" + width + " height:" + height);

If for example you follow the link:  data:application/octet-stream;base64,SGVsbG8=  The browser will prompt you to download a file consisting of the data held as base64 in the hyperlink itself.  Is there any way of suggesting a default name in the markup?  If not, is there a JavaScript solution?


production = {         'item1': '500',         'item2': '10000',     }   I'm trying to get the highest value from that dict, which would be 10000. However, I'm getting 500 as return of max(production.values()).  I believe it's like that because it's getting the highest value from string, not int (taking the lexicographical order of their codepoints).  Could someone help me with a solution. Thanks!

I have a dictionary: keys are strings, values are integers.  Example:   stats = {'a':1000, 'b':3000, 'c': 100}   I'd like to get 'b' as an answer, since it's the key with a higher value.  I did the following, using an intermediate list with reversed key-value tuples:  inverse = [(value, key) for key, value in stats.items()] print max(inverse)[1]   Is that one the better (or even more elegant) approach?


I run jupyter notebook (Python editor) on background in order to keep one terminal for keep working without needs to run a second terminal. so I have done this:   #jupyter notebook &   but the problem is when jupyter notebook is running it keeps send me logs, and this is typically painful and bother me when I'm typing command.  I wanted to stop jupyter notebook to send me these logs???

When I launch certain programs from the command line like eclipse and document viewer in 11.10 it spews a load of information that seems inconsequential.   Also when they are run in the background they sometimes continue to produce output to the terminal which I am currently working on, which is irritating.  I would like them just launch and keep the background stuff in the background. My reasoning is that if you launch these programs through the GUI (eg double clicking on an icon) these messages are never shown to me, so I don't need them in the command line.


I know that the copy command has an option to automatically replace a file if it already exists, but I want to know if it is a way to copy the files only if they not already exist (/Y). I do not know the actual file names in the batch code, as I copy from the source using wildcards in the copy command:  copy *.zip c:\destination   The reason I want this instead of automatic overwrite is that the files are large, and to skip existing would save a lot of execution time. It is done over a network share, so copying this amount of data can take a while...  Additional info: This is a batch job that runs a backup thing to copy zip files from my computer to a shared server, and in case the batch job didn't finish for some reason (only some of the zip files copied), I need to run the batch again, but only for those zip files that wasn't copied before.

Is it possible to use robocopy to copy only the files that do not exist in destination?  robocopy has a /is (include same files) switch. What I am looking for is an /xs switch. If a file exists in both the source and the destination I don't want it to be copied. The criteria is file name only, regardless of modified day, size, etc. For example, even if the source has a newer file (based on modified date) than the same file in the destination, I don't want it to be copied. Possible to do this? Thanks.


I want to force caching the installed packages with apt-get install (apt install) in /var/cache/apt. Currently, I found some of them are cached, but most of them are not. I want to cache all of them to install them on another machine by copying these packages without downloading them again from the Internet, especially for large packages which cost a lot of time.

I know that packages installed with apt-get are stored in /var/cache/apt/archives.  I just installed mariadb server in Ubuntu 16.04 with following command:  sudo apt install mariadb-server   When I tried to find packages in /var/cache/apt/archives, there are no packages. Where are they stored if it's not in this directory?


In worlds, they do lane swaps that are not to be seen anywhere else. Duo bot doing jungles and top lane, or whatever.  Why do they do this exactly, and when should this be done?

I've seen a lot of games in the LCS and All-Star, and they sometimes changed bot and top lanes.   When is this a good practice? What do you gain from doing this? Should I do this to avoid counters or if my solo laner has more sustain than theirs?


To describe an event with a beginning but no end, meaning that it goes forever into the future, one could say it is "endless".  What word would describe an event with no beginning but an end, meaning that it goes forever into the past? 'Startless' doesn't seem to be used for this (or much at all).  In a sentence:     They were so used to the custom that they considered its existence [to not have a beginning].

Is there a single word for: something that has no beginning or without a beginning


For  I had to change the opening angle bracket to &lt;. Is this a bug, or established expectation?

Consider the following piece of Markdown code:  This is some regular text.      >>> def factorial(n):     ...     return 1 if n < 2 else n * factorial(n - 1)     ...   * This is a list item.      >>> def factorial(n):     ...     return 1 if n < 2 else n * factorial(n - 1)     ...    Notice that the second code block is preceded by a list item.   Why is the factorial code not properly formatted under these circumstances? To demonstrate the problem, I'll insert the Markdown code show above:    This is some regular text.  >>> def factorial(n): ...     return 1 if n < 2 else n * factorial(n - 1) ...     This is a list item                 def factorial(n):       ...     return 1 if n < 2 else n * factorial(n - 1)       ...               This applies to numbered as well as unnumbered lists.


I've copied 9 lines from a PDF, and I want to past it in Vim. Could anyone be able to tell how to do it?  Thanks in advance!

I can cat a file, copy and paste text with the middle button or shift-insert.  How can I copy text in vim and paste it from the system clipboard?


Let $R$ be a commutative, unital ring and let $I$ be an ideal of $R.$ Prove that if $I$ is maximal then $R/I$ is a field.   This problem is probably trivial for most of you abstract algebra fans out there, but remember that I'm new to the field, so please don't use some next-level math that I can't understand at all. I think this problem could be solved using next-level math very quickly though.   For this problem, I know that fields are commutative, unital, and every nonzero element is a unit/invertible. Also, $I$ is maximal wrt subset, so if there is an ideal that contains $I,$ then it must be $R.$

If $I$ is a maximal ideal of $R$, why is $R/I$ a field?  I'm trying to use the fact that $I$ is maximal to show that $R/I$ only have ideals $\{0\}$ and $R/I$. Can anyone help me with this method. Many thanks.


recently I got an old laptop with 1 GB ram and 1.7 GHz proccessor. also I have found the terrible windows! I will be glad if I can completely destroy the installation of Windows XP and download the beautiful Ubuntu, but I'm confused... would it be okay if I download 12.10 32bit? because I think it will be slow. any idea about that? or should I use Xubuntu?  thanks advance.

For a given hardware configuration, how do I find out if Ubuntu will run on it? What considerations should I take into account when choosing an Ubuntu version and  such as:    with a lighter desktop than the usual Gnome and Unity  with the even lighter LXDE desktop   Obviously Ubuntu does not run on some processor architectures. So how do I go about choosing the right version and derivate. How can I find out the minmal system requirements?


So I am trying to upload this logo -   Have tried from 110x110 72dpi all the way through to 12000x12000 150dpi jpeg and png. All look awful!  After doing a bit of research think it may be because of the red, I have already tried just adding some noise but it has completely changed the image when I upload to instagram. I feel like that is somewhat a good sign as it definitely makes a difference but I'm look for suggestions about the kind of noise I should be using or what settings when I apply the filter.

I am not a graphic designer at all. The first logo I made was in Photoshop for my Etsy store. Now I want to move off Etsy but can't make my own website until I have good quality graphics.  So I made the logo as a vector in Inkscape.  It looks fine but as soon as I set it as my Instagram logo or anything, it looks super blurry and awful. I have tried different formats and making it the size px instagram requires, but it always comes out looking the same.   I've attached the png and also a screen shot of how it looks on Instagram.


I read other topics about this error:  acpi ppc probe failed    But I haven't found a solution how to turn it off. Can ignore it - I know, but I don't want it to display at startup. Console distorts my Plymouth themes.  I don't want to fix the problem if it isn't necessary, only to hide it.  Xubuntu 15.04 xfce 64 bit

ACPI PCC Probe Failed is the error that pops up instead of the default GRUB loader after I updated my kernel to 3.19.  I searched around and couldn't find much information except that it is a known error and it is registered in kernel.org's launchpad . My question is, is anyone else facing it?, what are the impacts of this? And if only an update in the future can fix it, any suggestions or safety tips till then?


A friend of mine fell victim to a mailbox hijacker the other day, and Gmail helped her recover the inbox (via whatever method they do so, I was not present for that). I showed her how to recover her contacts (that has a handy recovery menu option) but she's missing data for about a week of email. It's not "hidden" in a filter, it's not "in the deleted bin".  Is there any way to get all of that emails back?

Is it possible to recover an email that has been clicked on "delete forever" in the trash folder? I have accidentally clicked delete forever for an email but now I need to recover it.


Is it possible to motion track a camera move that zooms mid way through the shot?

At the half of my shot (constantly moving camera) there is a focal length change. In my first tests the camera is moving forward instead of zooming into the scene. Is there a trick to automatically detect the focal length change?    Is it currently possible to reconstruct the camera from such a shot at all? Until now I only have found , but I could not figure out if this is part of blender.


I am using ArcGIS 10.1 for Desktop and I would like to know How to add the Count (which is visible on the Symbology tab of the Layer Properties dialog) to the legend?

I have made a series of  in ArcMap 10. When I classify the interval the bottom of the dialogue tells how many elements are in the class.  Is it possible to have this number automatically places beside my class labels?


The title is fairly self-explanatory, but I was wondering how one would write/say the possessive form of the name "Hopkins". Is it " Hopkins's " or " Hopkins' " or are both acceptable?

What is the possessive of a noun ending in ‑s?  Are these both right, or is the second one wrong?   the boys' books the boss' car


I want to search for a specific keyword in multiple pdf file using pdftotext command. Normally we can search inside a single pdf file using the following command:  pdftotext file.pdf - | grep keyword   But what we wil have to do if we want to search in multiple pdf files?

Normally, we can search a keyword in a list of pdf files using the following command:  for file in *pdf; do  pdftotext "$file" - | grep keyword done   Now, from the search result, If I want to find the title name along with the authors/writers of the file manually, without using pdfinfo command, what will I have to do?


Is it generally accepted to copy my own answers across questions / exchange sites? (assuming the questions are not duplicates and the answer solves both questions) Should I link back to the original?

The  currently says  In the context of Stack Exchange sites, any copying and pasting of any amount of text or code that wasn't written by you is plagiarism if you try, explicitly or implicitly, to pass it off as your own work. (italics mine)  There is also a concept of . Should this also be addressed in the FAQs? In other words, is it OK to copy (large parts of) your own answer  without proper attribution?


I'm trying to prove that ${n \choose r}$ is equal to ${{n-1} \choose {r-1}}+{{n-1} \choose r}$ when $1\leq r\leq n$.  I suppose I could use the counting rules in probability, perhaps combination= ${{n} \choose {r}}=\frac{n!}{r!(n-r!)}$.  I want to see an actual proof behind this equation.  Does anyone have any ideas?


This is my first ever post on Stack Overflow. I have had a good try with this and a good search for answers, but to no avail. So here goes:  I have made a basic messaging app just for coding practice. Obviously, I want it to be safe from xss so have used "HTMLspecialchars".   The problem: The app works fine as long as no one puts an apostrophe in the message. So the message "Let's go" throws an error:     let's go Error:INSERT INTO chat (msg) VALUES ('Hello let's go')   You have an error in your SQL syntax; check the manual that corresponds to your >MariaDB server version for the right syntax to use near 's go')' at line 2   Here's my code for inputting and sending to mysql:  <!DOCTYPE html>    <?php // define variables and set to empty values  $name = $msg = "";  if ($_SERVER["REQUEST_METHOD"] == "POST") {   $name = test_input($_POST["name"]);   $msg = test_input($_POST["msg"]); }  function test_input($data) {   $data = trim($data);   $data = stripslashes($data);   $data = htmlspecialchars($data);     return $data; } ?>
Messaging Appq
 <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">     Name: <input type="text" name="name" value ="<?php echo htmlspecialchars($_POST['name']); ?> ">

   Message: <textarea name="msg" rows="5" cols="40"></textarea>

   <input type="submit" name="submit" value="Submit">   </form>    <?php $servername = "localhost"; $username = "*********"; $password = "*********"; $dbname = "***********";  // Create connection $conn = new mysqli($servername, $username, $password, $dbname); // Check connection if ($conn->connect_error) {     die("Connection failed: " . $conn->connect_error); }  $name=$_POST['name']; $msg=$_POST['msg']; $bothd = $name . $msg;  $sql = "INSERT INTO chat (msg) VALUES ('$bothd')";  if ($conn->query($sql) === TRUE) {     echo "New record created successfully

"; } else {     echo "Error:" . $sql . "
" . $conn->error; } $conn->close(); ?>   So, I know i need to use "ent_quotes". But where should it go? I see the normal syntax is   <?php echo htmlspecialchars($str, ENT_QUOTES); ?>   and I have tried putting "ent_quotes" in the following positions, obviously not all at the same time:   <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"], ENT_QUOTES);?>">     Name: <input type="text" name="name" value ="<?php echo htmlspecialchars($_POST['name'], ENT_QUOTES); ?> ">

   Message: <textarea name="msg" rows="5" cols="40" value ="<?php echo htmlspecialchars($msg, ENT_QUOTES); ?>"></textarea>

   <input type="submit" name="submit" value="Submit">   </form>   I also tried adding it to the function:   function test_input($data) {       $data = trim($data);       $data = stripslashes($data);       $data = htmlspecialchars($data, ENT_QUOTES);         return $data;     }   Apologies if I am missing something obvious! I am relatively new to this!

If user input is inserted without modification into an SQL query, then the application becomes vulnerable to , like in the following example:  $unsafe_variable = $_POST['user_input'];   mysql_query("INSERT INTO `table` (`column`) VALUES ('$unsafe_variable')");   That's because the user can input something like value'); DROP TABLE table;--, and the query becomes:  INSERT INTO `table` (`column`) VALUES('value'); DROP TABLE table;--')   What can be done to prevent this from happening?


I need help finding the set of continuous functions $f : \Bbb R \to \Bbb R$ such that for all $x \in \Bbb R$, the following integral converges:  $$\int_0^1 \frac {f(x+t) - f(x)} {t^2} \ \mathrm dt$$  I am thinking it could be the set of constant functions but i havent been able to prove it :(   I have also noticed that you can kind of  take any two functions and stick them together (continuously extend one into the other) the resulting function verifies the property in question.  I hope you can provide some insight and thank you .

I need help finding the set of continuous functions $f : \Bbb R \to \Bbb R$ such that for all $x \in \Bbb R$, the following integral converges:  $$\int_0^1 \frac {f(x+t) - f(x)} {t^2} \ \mathrm dt$$  I think it might be the set of constant functions but i havent been able to prove it :(   I was thinking that you can use the stone weiestrass theorem considering the set of continuous functions on a closed  interval(non trivial) ,and a subset which contains the set of continuous functions whose integral above diverges in some point in that interval along with  with the set of constant functions. So in order to solve the problem i need only to prove that if two functions do not meet the condition of the problem then their product does not as well .  I hope you can provide some insight and thank you .


I have two Schengen visas. One is from the Netherlands and expires on 27-8-2015. My other visa is from France and starts on 28-8-2015.  My travel date is on 19-8-2015 so I will enter through Amsterdam airport and then I will travel to Ibiza on 21-8-2015.  I want to go back to Amsterdam on 6-9-2015. Can I travel home from Amsterdam or do I have to go to Paris to travel home?

I currently have a valid multiple entry Schengen visa that expires on Feb 10th (issued by the Spanish consulate). I need to visit the Czech Republic from Feb 9th to Feb 15th. For this, I am getting a visa starting Feb 11th from the Czech consulate as I was advised that I cannot have two simultaneous visas.   Is it possible for me to enter Czech republic on the current visa on Feb 9th, and stay past its expiry up to Feb 15th using the new visa without leaving the Czech Republic? Will there be any likely problem either while entering or exiting Schengen zone (I am entering Schengen in Frankfurt)?