I am looking for this, but cannot find yet. Do we have any Stack Exchange site which serves the purpose of book recommendations, reviews, analysis, feedbacks, etc.? This would have been great, as people could discuss, or give a heads up, or just leave a good overview/feedback on a particular book that another might find interesting. I think I do not do bad if I ask this here; however, if this questions is not supposed to be here, kindly let me know.
Stuff like polls, recommendations based on subjective constraints, puzzles, webcomics etc. do not belong on the serious main SE sites, where professionals should be considered at work and having just a few spare minutes ("code's compiling") to answer questions, so they should not be distracted by such things. However, I'd also like to have a home for these things still using the SE engine. For the reason I mentioned before, this needs to be a separate place though. Let's call it four.[sitename-here].com.
Clip tool gives ERROR 000732? How can I evaluate $$\sum_{n=1}^\infty\frac{2n}{3^{n+1}}$$? I know the answer thanks to , but I'm more concerned with how I can derive that answer. It cites tests to prove that it is convergent, but my class has never learned these before. So I feel that there must be a simpler method.  In general, how can I evaluate $$\sum_{n=0}^\infty (n+1)x^n?$$ Can I run Android apps on Ubuntu? Is it possible to run Android apps on Ubuntu? And I don't mean inside an emulator, but natively, as you would with any other application installed using the Ubuntu Software Center. How to block and unblock https access on OS X 10.9 I am working on a test project that requires me to block https access for a specific app on my Mac (OS X 10.9).   The instruction provided are "Chinese" to me and I have no idea where to start:  (Example: Alter the iptables) Steps:   Block the port:  root@QA9:/opt/appname/appnamerouter2# iptables --list root@QA9:/opt/appname/appnamerouter2# iptables -A INPUT -p tcp --destination-port 443/8443 -j DROP root@QA9:/opt/appname/appnamerouter2# iptables --list  For Open the Port:  root@QA9:/opt/appname/appnamerouter2# iptables -D INPUT 1 How do I diagnose the source of focus problem in a camera? Probably a novice question, but how do I correctly diagnose from a photo for what reason that camera wasn't able to focus properly?  It can be any 1 of the following   Unsteady hand Lens issue Metering Re-Calibration required in camera or ...   Is there a set of unsaid protocols that needs to be followed by a photographer?  Goal is to get a sharp and crisp image prior to editing.  [PS: I own a Nikon D5200.] Is it safe to use the command apt-get autoremove in this particular scenario? What is the best way to remove accents (normalize) in a Python unicode string? Does causation imply correlation? Correlation does not imply causation, as there could be many explanations for the correlation. But does causation imply correlation? Intuitively, I would think that the presence of causation means there is necessarily some correlation. But my intuition has not always served me well in statistics. Does causation imply correlation? Difference between $\Delta$, $d$ and $\delta$ I have read the thread regarding , but it does not answer my question.  I am confused about the notation for change in Physics. In Mathematics, $\delta$ and $\Delta$ essentially refer to the same thing, i.e., change. This means that $\Delta x = x_1 - x_2 = \delta x$. The difference between $\delta$ and $d$ is also clear and distinct in differential calculus. We know that $\frac{dy}{dx}$ is always an operator and not a fraction, whereas $\frac{\delta y}{\delta x}$ is an infinitesimal change.   In Physics, however, the distinction is not as clear. Can anyone offer a clearer picture? String processing in windows batch files: How to pad value with leading zeros? How can I completely remove ecryptfs from my system and delete .Private? Few days back I have installed ecryptfs, created a private directory using it. Now my Ubuntu login became super slow. I have tried removing ecryptfs from Synaptic. I found It, it can not be deleted that way. Somewhere I have read about this command  ecryptfs-setup-private --undo   But this command displays a rather confusing list of commands on terminal. I don't want to mess up my installation, neither want to loose my administrator account.  Now my question is, how can I safely remove /home/user/Private (.Private) and remove ecryptfs encryption ? Openlayers using Google Maps as base layer: possible to zoom out farther than max extent? See attached picture. This is how it is when the page loads. I'm currently using  map.zoomToMaxExtent();     Everything is working pretty well but I'd like to zoom out more/see the whole world using OSM/Google Map Layers: is this even possible?  Note that the zoom bar on the left is set to the lowest bar when the page loads (if you can't see the map well, just right click the image and paste into a new browser tab).   This  but even when I do MIN_ZOOM_LEVEL that doesn't do much.  Also note I am not setting any bounds, extents, or resolutions. Toying with those did not seem to do the trick either.   Any input is appreciated.   Edit: here's a codeshare if you want to take a look:   UPDATE:  This is not perfected yet (and it makes me think something may be wrong with my OL code itself) but currently I am using this   var extent = new OpenLayers.Bounds(-1.32,81.71,-1.18,-61.80).transform(new OpenLayers.Projection("EPSG:4326"), new OpenLayers.Projection("EPSG:3857"));   I tried   var extent = new OpenLayers.Bounds(-20037508.34279,-10018754.17139,20037508.34279,10018754.17139);   (both with and without transform) but this did not do anything.   UPDATE 2:   wrapDateLine: false works fine for now: can zoom out farther, pan around, etc etc.  Now I would like to cut off everything to the left of the date line on the left side of the map (the 'first' portion), and cut off everything to the right of the date line on the right side of the map (the '3rd' portion) WHILE still keeping the map full screen. I've tried bounds, resolutions, but no go. Is this even feasible?  Something like this but it should take up the full screen: possible to do? See below: Why is a suspicious program draining my battery with GPS usage? How do I suppress stderr warning messages from a command inside command substitution? touch ~/deleted/$(echo "directory_"$(readlink -f foo)|tr '/' '\') 2&gt; /dev/null   where foo is a directory  It's reading the full pathname of foo and creating it as a file replacing all '/' with '\' and putting a directory_ in front so the directory  /home/test/foo would create a file directory_\home\test\foo  It does exactly what I want except a warning keeps printing tr: warning: an unescaped backslash at end of string is not portable   a. I don't know what that means b. I would like it to not show  I tried to redirect stderr to /dev/null but it doesn't work. How do I suppress it? Is there a way to access an iteration-counter in Java's for-each loop? Is there a way in Java's for-each loop  for(String s : stringArray) {   doSomethingWith(s); }   to find out how often the loop has already been processed?  Aside from using the old and well-known for(int i=0; i &lt; boundary; i++) - loop, is the construct  int i = 0; for(String s : stringArray) {   doSomethingWith(s);   i++; }   the only way to have such a counter available in a for-each loop? Is there any way to check whether a file is locked without using a try/catch block?    Right now, the only way I know of is to just open the file and catch any System.IO.IOException. Why gpedit and the corresponding registry entries are not synchronized? Network button missing gone from Nautilus? I'm using Ubuntu 16.04.3 LTS.  I remember having a link in Nautilus that I used to browse network shares with in the past. I don't remember exactly but I think it was "Windows network" or "Browse network".  Now I can't find this on my current installation, there's only "Connect to server", but this is not what I want. Is there a way to put that link there? mysterious error: \pdfendlink ended up in different nesting level than \pdfstartlink I ran into the "mysterious"  \pdfendlink ended up in different nesting level than \pdfstartlink   error.  According to , "this happens when hyperref is used under pdftex and a citation splits across a page boundary".  The given solution is to manual fix the citation to not split across the page boundary.  However, this workaround isn't feasible for me, as the documents are automatically generated on a server with no user interaction.  Is there any solution to the problem known, perhaps an experimental hyperref action or a patch to pdftex?  (Probably, one could use luatex to solve the problem, but for other reasons, luatex is not an option in this project.)  MWE:  \documentclass[%draft               ]{article} \usepackage{hyperref} \setlength{\textwidth}{3cm} \setlength{\textheight}{3cm}  \begin{document} Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna \href{http://www.tug.org/errors}{aliquyam erat, sed diam voluptua.} \end{document} In my native language, double negations "cancel out". I have been trying to learn English using movies and such things, but double negation confuses me. I see instances when double negation cancels out, and some when they do not.  For example, "I haven't got no money" is interpreted as "I have no money." "There wasn't anyone who didn't enjoy the party" is interpreted as "Everyone enjoyed the party."  Is this context dependent? If so, how does one decide which interpretation is correct?