I was interested if I can use a different flavor of gravatar instead of identicon.  When you click on the change picture text on your profile picture it has the Identicon and Upload options. I clicked Identicon (which already had the green tickmark) and my avatar changed (which obviusly sould not have happened as I have not changed any options).  For a reference you can see my old avatar here:    And my new one on Stackoverflow:     I have no recollection of changing my email address at any point during the lifetime of my account. (It was registered using Google-authentication). I have no Gravatar account registered.   Edit: My profile email (md5-ed) address would give the old avatar:
I had an (extremely minor) identity crisis when I clicked on my username and saw a different identicon than I'd had previously. :)  According to , your identicon is based on a hash of your last known IP address.  Since a user's profile picture part of their identity, I would prefer if my profile picture only changed through deliberate action on my part.  Since the user's IP hash is already saved (the identicon has to be displayed to people even during the unthinkable periods when we're not actively browsing), I propose preserving the first one assigned to a user, and not updating it even if the user's IP address changes.  Are there any upsides to the current behavior that I haven't thought of?
Is it possible to exit the airport without going through the customs? How to find out what's accessing a particular hard drive on Windows? Why are second order linear PDEs classified as either elliptic, hyperbolic or parabolic? Is there a geometric interpretation of second order linear partial differential equations which explains why they are classified as either elliptic, hyperbolic or parabolic, or is this just a naming convention? That is, do they have any relation with actual ellipses, hyperbolas and parabolas? I want to make a long shadow just like in this image.  I can create this shadow with shapes and by deleting the unwanted shadows after rasterizing the layer. But it's not very reusable. I can't resize the layer after rasterizing it.  Is there any easy way to make a long shadow like in the image below? As the title says. I use, among other things, the following in my lstset:  framerule=1pt, frame=tblr   Some places a page break happens in the middle of my \lstlisting. Fine. But sometimes the whole code of the listing appears on one page, but the bottom frame appears on the top of the next page!    I know that I can float a particular listing, but I have a long document with many listings, and I don't want to float all of them; Most of them also need to be exactly where they are declared. That they are broken over a page doesn't bother me that much.  Is there something that can stop this from happening, without me needing to adjust each individual listing?   had the same problem, but fixed it by removing spaces in front of keywords in a custom language definition. I too have a custom language definition, but his solution doesn't help me. I managed to recreate the situation without a custom language.  Edit and MWE  I managed to reproduce it in a minimal working example. 's a pastebin, if that's helpfull.  \documentclass[UKenglish,a4paper,11pt]{report} \usepackage{babel}  %% Adjustments \addtolength{\topmargin}{-1\baselineskip} \addtolength{\textheight}{4\baselineskip} \pretolerance = 2000 \tolerance = 5000   \hbadness = \tolerance  %% Smaller font \usepackage{mathptmx}  %% LISTINGS \usepackage[final]{listings} \lstset{     xleftmargin=1.5em,     framexleftmargin=1em,     framextopmargin=0.5ex, %%  THE FRAME:     framerule=1pt,     frame=tblr }  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  \usepackage{lipsum}     % for demo \begin{document} \subsubsection{Lorem}   % some fiddling to get the "wrong spacing just right": \lipsum[1-3] \subsubsection{Ipsum}  \lipsum[1] and then some text  \begin{lstlisting} Here is a listing with three lines of code; The bottom border is placed on the next page! \end{lstlisting}  Can you believe it..?! \end{document}   This MWE is rather long. My document inputs most of the listings stuff from files written by others, so I'm not sure what all of it does. If anyone sees some lines that they are sure is irrelevant, feel free to take it out of the MWE.  "Fun fact"  An equally silly situation occurs if you remove \usepackage{mathptmx}: The whole code listing will then appear on the new page, except for the top frame which is left on the bottom of the first page! Evaluating the double limit $\lim_{m \to \infty} \lim_{n \to \infty} \cos^{2m}(n! \pi x)$ I have to find out the following limit $$\lim_{m\to\infty}\lim_{n\to\infty}[\cos(n!πx)^{2m}]$$ for $x$ rational and irrational. for $x$ rational $x$ can be written as $\frac{p}{q}$ and as $n!$ will have $q$ as its factor the limit should be equal to 1. the second part of irrational is giving me problems. I first thought that limit should be zero as absolute value of cosine term is less than 1 and power it to infinity you should get $0$. But then I realised that it was wrong. I brought the limit down to this form. $$e^{-\sin^2(n!πx)m}$$ after this I find the question quite ambiguous as they have just said $x$ is irrational. If I take $x$ as $\frac{1}{n!π\sqrt{m}}$ I get the limit as $\frac{1}{e}$ but if I take  $x$ as $\frac{2}{n!π\sqrt{m}}$ I get the limit as $\frac{1}{e^4}$. please help me and tell me where have I gone wrong? Phantom spaces in listings I have a problem with SQL code in a PDF document. For code representation I'm using the listings package. Everything works perfect until I copy-paste that code from the created PDF document. I get some phantom spaces in string type. When people are reading my PDF document, they need to copy-paste some of the code. Visually the code looks good in PDF, but when I try to copy-paste my code to NotePad or any other editor I get some unexpected spaces in strings. In the example below, when I copy-paste my SQL code, instead of getting:  SELECT ST_Area(the_geom)   FROM katastar   WHERE kc_broj = '1414';   I get  SELECT ST_Area(the_geom)   FROM katastar   WHERE kc_broj = ' 1414 ';   See the spaces in between quotes.  \documentclass{article} \usepackage{listings,xcolor}  \lstset{  tabsize=4,         basicstyle=\scriptsize,         %upquote=false,         aboveskip=\baselineskip,         columns=fixed,         showstringspaces=false,         extendedchars=true,         breaklines=true,         prebreak = \raisebox{0ex}[0ex][0ex]{\ensuremath{\hookleftarrow}},  frame=single,         showtabs=false,         showspaces=false,         identifierstyle=\ttfamily,         keywordstyle=\color[rgb]{0,0,1},         commentstyle=\color[rgb]{0.133,0.545,0.133},         stringstyle=\color[rgb]{0.627,0.126,0.941},  language=SQL }  \begin{document} \begin{lstlisting} SELECT ST_Area(the_geom)   FROM katastar   WHERE kc_broj = '1414'; \end{lstlisting} \end{document} What space does the spell Cloud of Daggers fill? I am trying to workout what template  (PHB, p. 222) would be on a grid. The spell states:     You fill the air with spinning daggers in a cube 5 feet on each side, centered on a point you choose within range.   So does that mean it would look like this:     Or like this:    From what I've read online, there seems to be some suggestion that it is a single square (tile) though this does stack with the spell description of "a cube 5 feet on each side".  Clearing this up for my group would be great, and I am sure our DM will be pleased as his monster were nicely diced by this spell. Thanks. Why can't the Polynomial Ring be a Field? I'm currently studying Polynomial Rings, but I can't figure out why they are Rings, not Fields. In the definition of a Field, a Set builds a Commutative Group with Addition and Multiplication. This implies an inverse multiple for every Element in the Set.   The book doesn't elaborate on this, however. I don't understand why a Polynomial Ring couldn't have an inverse multiplicative for every element (at least in the Whole numbers, and it's already given that it has a neutral element). Could somebody please explain why this can't be so? How the `\alignat` works in ams package I have read the related question(), which had detailed answer but still don't know what the meaning of the \alignat's argument. It is said in  that      This environment takes one argument, the number of “equation   columns”: count the maximum number of &amp;s in any row, add 1 and and   divide by 2.   What is the meaning of adding one in &amp; number and divide by two? I presumed the argument is given by the user, not automatically generated by the system? Do the Manuals and Tomes allow you to exceed 20 in an ability score? And can they be stacked? I am looking at items like Manual of Bodily Health, Tome of Clear Thought, etc.  Quoting from Manual of Bodily Health     If you spend 48 hours ... your Constitution score increases by 2, as   does your maximum for that score.   This sounds to me like when you read the tome according to the instructions, you are then allowed to increase your CON up to a maximum of 22.     Is that a correct reading -- that these magic items allow a player to override the usual ability score maximum of 20? Probably, you were already at 20 when you read it, but if, say, you were at 18 and read it to bring your CON up to 20, could you then later increase your CON further via feats or ability score increases gained at certain levels? Can you read more than one book of the same type, to increase your maximum by an additional 2 points? There are several ways to execute a script. The ones I know are: /path/to/script # using the path (absolute or relative) . script        # using the . (dot) source script   # using the `source` command  Are there any other way? What are the differences between them? Are there situations that I must use one and not another? How do we get the last day of the month from a given date Is there a function or method to give the last day of a month? For example if the date is 27 feb 2013, the last date should be 28 feb 2013 , it become 29 if its a leap year. if the date was 2 jan then it should return 31 Jan.  If there is no function then any ideas on how we can get this?  Thanks Rules for refreezing food What are the general rules regarding when can you refreeze food that was frozen and then thawed in the fridge? and what are the reasons behind them? (Hygiene? Food quality?). Let's assume for the sake of the argument that the items were in a non-frozen state only a few hours.  To be more specific, I'm interested in the application of these rules for  - Ginger garlic paste - Dough - Indian Curries - Green Chilly paste - Frozen green peas After a brief discussion with @MonicaCellio (In the comment) - It has come to my attention that perhaps I chose the wrong words to describe my original idea (In the edit history). When I wrote "social features" I was actually suggesting an alternative way to for users to share their knowledge using a new type of post and articles and not just by questions and answers.   The basics of my idea was to allow users to write articles on topics relevant to the community on the SE websites just as any answer posted is expected  to be too. Allowing users to write their own content (I.E posts/articles/etc..) will be granted as a privilege for advanced users so that not anyone could write stupid things, users that will write content must be established and well-familiar with the rules of SE.   I know anyone can start a blog, but it's require frequent maintenance and content updates, while writing on SE ensure that it addressed to a large, well-established community, with a similar fields of interest.  Posts writing will follow the same guidelines as asking and answering questions does, but it will provide an alternative for users that are mostly answering specific questions, as a new method to contribute to the community.   By writing, one may also reveal more about their personality, wit, way of thinking, ETC. That's when the "social" takes place - You'll also have "authors" and not just "users" you can remember by their catchy name, but people that you can remember by the field of interest they are writing content about.   They key points will be:    Users will be able write rich content with advanced WYSIWYG HTML editor, content that doesn't require a question to answer, but that is still relevant to the SE website it is writing on. Users will be able to Upvote/Downvote other users posts. Posts will be listed on their author profile, so it will not just show the activity, but additional layer of user generated content. Popular posts with high reputation could be associated to tags making the information of tags richer with user generated content Users will be able to include links in answers not only to other questions, but also to posts. User will be able to comment on post to allow the author to correct and improve it. It will improve the interaction and offline discussions (Which are prohibited when it come to long discussions on questions and answers). I believe that users will be happy to share their own tutorials, tips and tricks - Because they are already doing so when answering questions, but before the can start, they'll have to earn enough reputation to ensure that only high profile users will be able to write high profile content, and not just any rubbish. It will provide another type of method for voting and getting earning reputation Users will be able to include content in their CVs on SO Jobs.  Opportunity to earn some new badges.   So it's a Mega feature request and it require some detailed design work, but I do think that it will invite a new type of activity for users on SO (and the rests of the sites of-course). Support anchor names in posts I admit this feature request is probably somewhat limited in useful scope, but I'm throwing it out there anyway. Inspired by , and because I want to use it on , I'm requesting that name be supported on a tags in posts.  On very long answers, such as the closing/migration guidance answer, this would allow direct linking to the specific closure reason. This would then allow us, when someone , to link directly to the appropriate reason and description thereof.  I recognize the limited scope of this, however, I have seen other long answers that could stand to have that kind of "deep" linking ability as well.  (The original incarnation of this post had either name or id, but preferenced name. Per Koper's answer, which I agree with, I took out the idea of supporting id, because Koper's right -- too dangerous.) Lowering the throttling temperature in Windows 8 for a laptop $\mathbb Z_{p^n}$ is not the direct product of any family of its proper subgroups I'm trying to solve this question of Hungerford's Algebra book:     $S_3$ is not the direct product of any family of its proper subgroups.   The same is true of $\mathbb Z_{p^n}$.   The first claim is easy: we note that every subgroup of $S_3$ is of order $2$ or $3$ by Lagrange, since its subgroups are of prime order, they are cyclic, then abelian, but $S_3$ is not abelian, contradiction because $S_3$ is not abelian while the direct product of abelian groups has to be abelian.  My problem is with the second claim, I need help. What is the difference between re.search and re.match? What is the difference between the search() and match() functions in the ?  I've read the  (), but I never seem to remember it.  I keep having to look it up and re-learn it.  I'm hoping that someone will answer it clearly with examples so that (perhaps) it will stick in my head.  Or at least I'll have a better place to return with my question and it will take less time to re-learn it. Tikz, Tree without overlaps I'm trying to get a nice tree without the overlaps, can anyone help me to improve my code?  \documentclass{standalone} \usepackage{amssymb} \usepackage{amsmath} \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \usepackage{dsfont} \usepackage{tikz} \usetikzlibrary{shapes} \usetikzlibrary{graphs}  \begin{document}       \begin{tikzpicture}[baseline,level/.style={level distance=20mm, sibling distance =35mm/#1},scale=1]         \node [ellipse split, draw] {$s_1&lt;s_2$\nodepart{lower}\tiny $(s_1,s_2,s_3,s_4)$}             child{ node [ellipse split, draw] {$s_1&lt;s_2$\nodepart{lower}\tiny $(s_1,s_2,s_3,s_4)$}                 child{ node [ellipse split, draw] {$s_1&lt;s_2$\nodepart{lower}\tiny $(s_1,s_2,s_3,s_4)$}                     child{ node [rectangle, draw] {$(s_1,s_2,s_3,s_4)$}}                     child{ node [ellipse split, draw] {$s_1&lt;s_2$\nodepart{lower}\tiny $(s_1,s_2,s_3,s_4)$}                         child{ node [rectangle, draw] {$(s_1,s_2,s_3,s_4)$}}                         child{ node [ellipse split, draw] {$s_1&lt;s_2$\nodepart{lower}\tiny $(s_1,s_2,s_3,s_4)$}                             child{ node [rectangle, draw] {$(s_1,s_2,s_3,s_4)$}}                             child{ node [rectangle, draw] {$(s_1,s_2,s_3,s_4)$}}                         }                     }                 }                    child{ node [ellipse split, draw] {$s_1&lt;s_2$\nodepart{lower}\tiny $(s_1,s_2,s_3,s_4)$}                     child{ node [ellipse split, draw] {$s_1&lt;s_2$\nodepart{lower}\tiny $(s_1,s_2,s_3,s_4)$}                         child{ node [rectangle, draw] {$(s_1,s_2,s_3,s_4)$}}                         child{ node [ellipse split, draw] {$s_1&lt;s_2$\nodepart{lower}\tiny $(s_1,s_2,s_3,s_4)$}                             child{ node [rectangle, draw] {$(s_1,s_2,s_3,s_4)$}}                             child{ node [ellipse split, draw] {$s_1&lt;s_2$\nodepart{lower}\tiny $(s_1,s_2,s_3,s_4)$}                                 child{ node [rectangle, draw] {$(s_1,s_2,s_3,s_4)$}}                                 child{ node [rectangle, draw] {$(s_1,s_2,s_3,s_4)$}}                             }                         }                     }                     child{ node [ellipse split, draw] {$s_1&lt;s_2$\nodepart{lower}\tiny $(s_1,s_2,s_3,s_4)$}                         child{ node [rectangle, draw] {$(s_1,s_2,s_3,s_4)$}}                         child{ node [ellipse split, draw] {$s_1&lt;s_2$\nodepart{lower}\tiny $(s_1,s_2,s_3,s_4)$}                             child{ node [rectangle, draw] {$(s_1,s_2,s_3,s_4)$}}                             child{ node [ellipse split, draw] {$s_1&lt;s_2$\nodepart{lower}\tiny $(s_1,s_2,s_3,s_4)$}                                 child{ node [rectangle, draw] {$(s_1,s_2,s_3,s_4)$}}                                 child{ node [rectangle, draw] {$(s_1,s_2,s_3,s_4)$}}                             }                         }                     }                 }             };     \end{tikzpicture} \end{document}