I can see two expressions about Operating System: "on Linux" and "in Linux". E.g.:      The application can run on Linux.     The application can run in Linux.    Which one is right? Or both are right?
When we say something in specified operating system, which preposition should I use?  e.g.     I play games {in/on/under} Windows.
I have attached an image as an example below. I want to twist a rectangle. Do I have to convert that rectangle into a curve or into mesh and then twist it with ctrl+T?   Please explain with an example. How do I type Arabic text in Photoshop? I want to type Arabic text in Photoshop, but the text appears disjointed and the letters do not connect at all. For example محمد appears as م ح م د.   I'm using Photoshop CS6 on OSX Mountain Lion. Did Voldemort die or stay in limbo after the final battle? In Harry Potter and the Deathly Hallows, while Harry is in Kings Cross he sees something like a small child, which is the fragment of Voldemort's soul that was attached to him.     He recoiled. He had spotted the thing that was making the noise. It had   the form of a small, naked child, curled on the ground, its skin raw and rough, flayed-looking, and it lay shuddering under a seat where it had been left, unwanted, stuffed out of sight, struggling for breath.      He was afraid of it. Small and fragile and wounded though it was, he did not want to approach it. Nevertheless he drew slowly nearer, ready to jump back at any moment. Soon he stood near enough to touch it, yet he could not bring himself to do it. He felt like a coward. He ought to comfort it, but it repulsed him.      Harry Potter and The Deathly Hallows   Once Harry returns to the world of the living, that part of Voldemort's soul stays in limbo. Is this what happens to all fragments of someone's soul if he has divided his soul by creating a Horcrux? Does that mean that Voldemort's soul however crippled will stay in limbo or when all parts of his soul die, so does he? How to generate all permutations of a list? How do you generate all the permutations of a list in Python, independently of the type of elements in that list?  For example:  permutations([]) []  permutations([1]) [1]  permutations([1, 2]) [1, 2] [2, 1]  permutations([1, 2, 3]) [1, 2, 3] [1, 3, 2] [2, 1, 3] [2, 3, 1] [3, 1, 2] [3, 2, 1] How to use host names rather than ip addresses on home network? I've a small home network up and running and managed to set up ssh. Can anyone tell me what I need to do to refer to one computer on the network from another by host name rather than IP address (which is what I'm doing now)? Can I move the Unity launcher? Calculating p-values for two tail test for population variance A sporting goods manufacturer claims that the variance of string tensions for any decent tennis racquet should be about 9 pounds. The string tensions of 18 randomly selected tennis racquets produced a variance of 8.13 pounds. Find the p-value to test the manufacturer's claim (assume the population is normally distributed).  I tried attempting the question as follows: ${H_o}: {\sigma ^2} = 9$ ${H_1}: {\sigma ^2} \ne 9$ We are also given the following: $n=18$ $s^2 = 8.13$ Test Statistics: $\chi^2 = {{(n-1)S^2}\over{\sigma^2}}$ Calculating Test Statistics under $H_o$ gives us: $\chi^2 = {{(18-1)8.13}\over 9} = 15.35667$  For calculating the p-value I proceeded as follows: $p-value = 2\min\{P[\chi^2&gt;15.35667],\ P[\chi^2&lt;15.35667]\}\ =2\times 0.430192 = 0.860384$  I am not certain if my method for calculating the p-value is correct or not. Can someone please tell if the above process is valid?  Thanks in advance! I'm having trouble editing this file on Windows 7:  C:\Program Files (x86)\CMake 2.8.7\share\cmake-2.8\Modules\FindJNI.cmake   If I edit it in Cygwin (vi) or TextPad, those two programs see the changes, so it's getting written to disk somewhere.  But if I "type" the file in a DOS cmd shell, it looks like the file hasn't been changed at all.  One thing I noticed is that in the cmd shell, the owner is Administrators, but in Cygwin's bash shell, the owner is Dan:  C:\Program Files (x86)\CMake 2.8.7\share\cmake-2.8\Modules&gt;dir /Q FindJ*  Volume in drive C is Windows7_OS  Volume Serial Number is 92CA-8707   Directory of C:\Program Files (x86)\CMake 2.8.7\share\cmake-2.8\Modules  12/30/2011  09:45 AM             1,480 BUILTIN\Administrators FindJasper.cmake 12/30/2011  09:45 AM             7,951 BUILTIN\Administrators FindJava.cmake 12/30/2011  09:45 AM            10,632 BUILTIN\Administrators FindJNI.cmake 12/30/2011  09:45 AM             1,669 BUILTIN\Administrators FindJPEG.cmake                4 File(s)         21,732 bytes                0 Dir(s)  132,524,654,592 bytes free   Dan@home /c/Program Files (x86)/CMake 2.8.7/share/cmake-2.8/Modules $ ls -al FindJ* -rwx------+ 1 Dan            None 10636 Jan 30 13:57 FindJNI.cmake -rwx------+ 1 Administrators None  1669 Dec 30 09:45 FindJPEG.cmake -rwx------+ 1 Administrators None  1480 Dec 30 09:45 FindJasper.cmake -rwx------+ 1 Administrators None  7951 Dec 30 09:45 FindJava.cmake   How can this be?  It's like there are two different files with the same name in the same directory. What is the typical orbital life of an artificial satellite? The orbit of satellites around Earth eventually decays, or so I read. This is typically caused either by atmospheric drag, or by tides. I would assume most satellites have a limited service life in orbit. Hence the question - What is the typical orbital life of a satellite? How long before it's successor must be launched into orbit ?  EDIT: For instance, a weather satellite ConcurrentModificationException for ArrayList How can I solve the folowing Diophantine equation with two unknowns? Find one integer solution to the following Diophantine equation:   \begin{equation*} \\\forall \,x,y \in \mathbb{Z}\\ 6xy + x - y = 274 \end{equation*}   The resultat ist $x = 9$, $y = 5$ (Obtained with  )  I need to know a method that allows me to reach such a result. How can I calculate the value of these two variables in a Diophantine equation? For example: 6xy + x - y = 458 I have a dozen or so image files on my iMac's desktop.  Most of the time, after booting up my computer, it displays a thumbnail of each image (as it should).  But sometimes, the thumbnails won't show up (see screenshot below).    It appears to happen randomly.  I estimate that it happens about 20% of the time.  Why is this, and how can I prevent it from happening?  I am running OS X 10.9.4.  Thanks. Column count doesn't match value count at row 1 How to connect Android with MySQL using Mysql JDBC driver Disabled submit button on form vs allow submit then show errors? Given a field $F$, can you necessarily construct a field extension $E \supset F$ such that $\operatorname{Gal}(E/F) = S_n\,$? So essentially does margin collapsing occur when you don't set any margin or padding or border to a given div element? Why can we flag/vote a question on Meta as duplicate of another question which has no accepted/upvoted answers? When we flag/vote-to-close a question as a duplicate on Stack Overflow, and that potential duplicate doesn't have any upvoted or accepted answers, we are alerted that we can't use that question as a duplicate and can't continue. This same check does however not seem to apply to Meta questions. Why not? UITableViewCell content overlaps delete button when in editing mode in iOS7 Show that an integer of the form $8k + 7$ cannot be written as the sum of three squares. I have figured out a (long, and tedious) way to do it. But I was wondering if there is some sort of direct correlation or another path that I completely missed.  My attempt at the program was as follows:   A number of the form, $8k + 7 = 7 (mod 8)$. That is, we are looking for integers a, b, c such that $a^2 + b^2 + c^2 = 7 (mod 8)$.   LONG and TEDIOUS way: $$(8k)^2 = 0 (mod 8)$$ $$(8k+1)^2 = 1 (mod 8)$$ $$(8k+2)^2 = 4 (mod 8)$$ $$(8k+3)^2 = 1 (mod 8)$$ $$(8k+4)^2 = 0 (mod 8)$$ $$(8k+5)^2 = 1 (mod 8)$$ $$(8k+6)^2 = 4 (mod 8)$$ $$(8k+7)^2 = 1 (mod 8)$$  That is, using three of these modulo there is no way to arrive at  $$a^2 + b^2 + c^2 = 7 (mod 8)$$