Screen capture as stream over LAN
How to stream a video with VLC in a LAN
How to install PYPY3 on Ubuntu, for newbies? I want to install pypy3 in Ubuntu. I have read the answer for this question "How to install PyPy3 (2.1, beta) on Ubuntu?" and still have no idea what to do. Could some kind soul please explain it so that even I can understand it :)  Here's what I have done so far:  Went    Read that I had to go   Downloaded: pypy3-2.1-beta-linux_x86_64-portable.tar.bz2  Opened it with the Archive manager (because it seemed like a reasonable thing to do)  Extracted it to desktop/PYPY3  Then desperately tried all the shell commands I came across last night. I will not be able to give a clear account of what I tried and what errors came back, as it is kind of a blur to me at this point.  But I can tell you that I got the Tar thing unpacked at one point and that I have tried running the pypy executable from the command line from the folder containing it, but got this:   bash: /usr/bin/pypy: No such file or directory   Could someone please tell me what to do. (have read the readme, the install docs at pypy.org and lots of posts) Cite in the caption of a graphic but not in \listoffigures? Sometimes I'd like to cite the reference in the caption of a graphic. But I want to avoid that this citation is displayed in the \listoffigures. How can I achieve that?  Fore example with this code:  \begin{figure}[htb] \centering \includegraphics{overview_pyramid.png} \caption{Overview pyramid \cite{LM2010}}\label{fg:overview_pyramid} \end{figure} Can anyone provide some pseudo code for a roulette selection function? How would I implement this:    I don't really understand how to read this math notation. I never took any probability or statistics. How does the subject-verb agreement work when a singular noun describes a plural one? Of the following, which sentence is righter?  The computers is a good choice. The computers are a good choice.  Is there a rule about these types of formations? Please explain. Viruses in wine? Notation and the name choice for meet and join (in order theory) I have two simple questions:   From where do the names  come from? I don't see any intuition between those names in context of order theory. From where does the notation come? I have to admit, I always had an impression that notation we use is somewhat backwards... just take the look at the picture at the wikipedia!    I used this notation a lot of times and I have to admit that often I have to stop for a minute and convince myself that I'm indeed using it right. I'm hoping that learning a bit about origin and context of name choice and notation will make it easier. What does negative R-squared mean? Let's say I have some data, and then I fit the data with a model (a non-linear regression). Then I calculate the R-squared ($R^2$).  When R-squared is negative, what does that mean? Does that mean my model is bad? I know the range of $R^2$ can be [-1,1]. When $R^2$ is 0, what does that mean as well? Decision on rejected edits should be displayed as a notification to the editor Update, April 2014: I fully support  of adding the message where it belongs—in the actual editing form. This is less intrusive than displaying it as a notification, but it serves the same purpose. Can has?     Background  When you suggest an edit, the outcome of whether it was approved or rejected is buried deep within your profile. You have to navigate to Profile » Activity » Suggestions to find a list of your recent edits, but even those do not say anything about the outcome:    waffles♦ introduced this , but what can I learn from this page? I have to manually click through the edits to see whether they were rejected or not. This is  time-consuming or inefficient at best. There's also no learning involved at all, since there is no active feedback.     Feature request #1  If an edit was rejected, there should be a notification message displayed, linking to the page of the suggested edit (which states the reject reason).    This kind of feedback would improve the editing behavior, since otherwise, inappropriate suggestions might just continue.    Feature request #2  If the above is too intrusive, the messages in the profile's Activity section should be clearer, for example like this (compare against the first screenshot in the question):        This is similar to:     Here's some more explanation:  Let's assume the case of a user suggesting lots of edits that are in some way harmful. Maybe they were too minor, like only changing keyboard shortcuts to use kbd markup instead of boldface.   Yes, we've already had this on Super User. Since it only takes one user to approve / reject there, some of these edits might even have been wrongfully accepted, others  rejected. While this is a problem of its own, the user suggesting these edits will have a hard time even getting any kind of feedback.  They would never see the rejection messages because they're buried somewhere, unless they critically checked each suggestion in their profile. I doubt anybody would do this. Even more so, they might only look at their steadily climbing reputation, not really noticing a rejected edit.  Another case is users learning how to edit. How are we  if they're not told what they did wrong? They will just continue suggesting edits until somebody actually pings them in chat or comments somewhere.  Here's an  of a user who was completely unaware that he could see feedback somewhere in a dark corner of his profile, until he was banned from editing because he'd repeated the same mistake over and over. I am running Windows 8.1 N Pro x64 and there are 2 Internet Explorer processes that must be for 32 bit. It stays there even if Internet Explorer is closed. I tried ending the processes but they just come back. I run a x64 Internet Explorer. How can I stop those processes? Two envelope problem revisited I was thinking of this problem.  I believe the solution and I think I understand it, but if I take the following approach I'm completely confused. Problem 1:  I will offer you the following game. You pay me \$10 and I will flip a fair coin. Heads I give you \$5 and Tails I give you \$20. The expectation is \$12.5 so you will always play the game.  Problem 2:  I will give you an envelope with \$10, the envelope is open and you can check. I then show you another envelope, closed this time and tell you: This envelope either has \$5 or $20 in it with equal probability. Do you want to swap? I feel this is exactly the same as problem 1, you forgo \$10 for a \$5 or a \$20, so again you will always switch.  Problem 3:  I do the same as above but close the envelopes. So you don't know there are $10 but some amount X. I tell you the other envelope has double or half. Now if you follow the same logic you want  to switch. This is the envelope paradox.  What changed when I closed the envelope?? EDIT: Some have argued that problem 3 is not the envelope problem and I'm going to try and provide below why I think it is by analysing how each views the game. Also, it gives a better set up for the game. Providing some clarification for Problem 3: From the perspective of the person organising the game:  I hold 2 envelopes. In one I put \$10 close it and give it to the player. I then tell him, I have one more envelope that has either double or half the amount of the envelope I just gave you. Do you want to switch? I then proceed to flip a fair coin and Heads I put \$5 in and Tails I put \$20. And hand him the envelope. I then ask him. The envelope you just gave me has twice or half the amount of the envelope you are holding. Do you want to switch?  From the perspective of the player:  I am given an envelope and told there is another envelope that has double or half the amount with equal probability. Do I want to switch. I think sure I have $X$, hence $\frac{1}{2}(\frac{1}{2}X + 2X) &gt; X$ so I want to switch. I get the envelope and all of a sudden I am facing the exact same situation. I want to switch again as the other envelope has either double or half the amount. What part of speech is there in the sentence “There is a book on the table?”  Also, while typing it out, another question pops up vis-à-vis punctuation. In my complete first sentence above, I ended it with a question mark since my main sentence is a question. The quote is not a question, but it looks like it because of the question mark. Is this the right way to punctuate? How to plot and visualize a single linear vector in 3D? How did Harry breach the Statute of Secrecy? Something always bothered me with Fudge's accusations:     “Disciplinary hearing of the twelfth of August,” said Fudge in a   ringing voice, and Percy began taking notes at once, “into offences   committed under the Decree for the Reasonable Restriction of Underage   Sorcery and the International Statute of Secrecy by Harry James   Potter, resident at number four, Privet Drive, Little Whinging,   Surrey." - OotP Ch. 8 "The Hearing"   Harry cast the Patronus Charm, so he violated the Decree for Reasonable Restriction of Underage Sorcery alright - extinuating circumstances aside - but how did he breach the Statute of Secrecy?  The only witnesses were Dudley and Mrs. Figg, both of whom already knew that Harry is a wizard. Earlier, even Hermione gets it wrong (don't tell her!):     They haven’t even reported that you broke the International Statute of   Secrecy. We thought they would,... - OotP Ch. 4 "#12"   Yes, Harry does use magic in front of a Muggle, Dudley, but even Dudley is not so thick that the fact that Harry's a wizard would come as a revelation to him. Harry cannot breach the Statute of Secrecy to someone already in the know.  Shouldn't Dumbledore point out that glaring error in the indictment sooner rather than later? Or at least mention it, at all?  Is there maybe a source that mentions the Statute of Secrecy containing a clause, that even the mere possibility of magic being witnessed by an uninitiated muggle is sufficient for its breach?? Cause if so, wouldn't even adult wizards have a really tough time doing anything, ever.  Possibly related: How to rank a million images with a crowdsourced sort Using article published dates effects SEO? In my blog I publish articles with date below under it.  My questions are:   Using dates will have positive impact or negative impact? After few years of publishing the post, since my post age is old will it remain in same position of search results or it will go down? Finally, should I use published dates or not? Make apt-get (or aptitude) run with -y but not prompt for replacement of configuration files? When running apt-get -y install &lt;packages ...&gt; on Ubuntu 10.04 I would like apt-get (or aptitude if that makes it easier) to not prompt me when installing additional dependencies (behavior of -y as I understand it) and but not prompt me about overwriting configuration files, instead assume to keep the existing ones always (which is usually the default). Unfortunately --trivial-only seems to be the inverse of -y and not affect the prompt that is shown, according to the man page.  In particular packages auch as samba, nullmailer, localepurge and lighttpd have forced me to interact with the terminal, even though the whole procedure was scripted and meant to be non-interactive. How can I make my AES encryption identical between Java and Objective-C (iPhone)? Upgrading straight handlebars to drop handlebars For $a\ge 0$ let's define $$I(a)=\int_{0}^{\pi}\ln\left(1-2a\cos x+a^2\right)dx.$$ Find explicit formula for $I(a)$.   My attempt: Let  $$\begin{align*} f_n(x) &amp;= \frac{\ln\left(1-2 \left(a+\frac{1}{n}\right)\cos x+\left(a+\frac{1}{n}\right)^2\right)-\ln\left(1-2a\cos x+a^2\right)}{\frac{1}{n}}\\ &amp;=\frac{\ln\left(\displaystyle\frac{1-2 \left(a+\frac{1}{n}\right)\cos x+\left(a+\frac{1}{n}\right)^2}{1-2a\cos x+a^2}\right)}{\frac{1}{n}}\\ &amp;=\frac{\ln\left(1+\dfrac{1}{n}\left(\displaystyle\frac{2a-2\cos x+\frac{1}{n}}{1-2a\cos x+a^2}\right)\right)}{\frac{1}{n}}. \end{align*}$$ Now it is easy to see that $f_n(x) \to \frac{2a-2\cos x}{1-2a\cos x+a^2}$ as $n \to \infty$. $|f_n(x)|\le \frac{2a+2}{(1-a)^2}$ RHS is integrable so $\lim_{n\to\infty}\int_0^\pi f_n(x)dx = \int_0^\pi \frac{2a-2\cos x}{1-2a\cos x+a^2} dx=I'(a)$. But  $$\int_0^\pi \frac{2a-2\cos x}{1-2a\cos x+a^2}=\int_0^\pi\left(1-\frac{(1-a)^2}{1-2a\cos x+a^2}\right)dx.$$ Consider $$\int_0^\pi\frac{dx}{1-2a\cos x+a^2}=\int_0^\infty\frac{\frac{dy}{1+t^2}}{1-2a\frac{1-t^2}{1+t^2}+a^2}=\int_0^\infty\frac{dt}{1+t^2-2a(1-t^2)+a^2(1+t^2)}=\int_0^\infty\frac{dt}{(1-a)^2+\left((1+a)t\right)^2}\stackrel{(*)}{=}\frac{1}{(1-a)^2}\int_0^\infty\frac{dt}{1+\left(\frac{1+a}{1-a}t\right)^2}=\frac{1}{(1-a)(1+a)}\int_0^\infty\frac{du}{1+u^2}=\frac{1}{(1-a)(1+a)}\frac{\pi}{2}.$$ So $$I'(a)=\frac{\pi}{2}\left(2-\frac{1-a}{1+a}\right)\Rightarrow I(a)=\frac{\pi}{2}\left(3a-2\ln\left(a+1\right)\right).$$  It looks too easy, is there any crucial lack?  $(*)$ — we have to check $a=1$ here by hand and actually consider $[0,1), (1,\infty)$ but result on these two intervals may differ only by constant - it may be important but in my opinion not crucial for this proof. How to know if other threads have finished?