I have ubuntu installed along side Windows 10. I want to factory reset my windows OS.  Will it affect my Ubuntu OS in anyway ?  What should I take care of before resetting ?
I installed Windows 7, which ate Ubuntu's boot file. When starting up the computer, it now goes straight to Windows, without giving me the option of booting Ubuntu.   How can I get Ubuntu back?
Let $X$ be a metric space. Prove that if every continuous function $f: X \rightarrow \mathbb{R}$ is bounded, then $X$ is compact.  This has been asked before, but all the answers I have seen prove the contrapositive. Realistically, this may be the way to go, but is there way to exhibit an unbounded continuous function (under the assumption $X$ is not compact) without appealing to results beyond introductory real analysis (e.g., the solution I've seen involves the Tietze Extension theorem)?  Because we're working with metric spaces, it's clear that the assumption that $X$ is noncompact (towards proving contrapositive) will lead us to extract a sequence of points in the space with no convergent subsequences. But how can we infer the existence of an unbounded continuous on the space knowing only about some sequence of points in this space (without using anything too advanced)? I am looking to build a camera trap for wildlife viewing, able to capture pictures (or even videos) in decent quality to be able to identify distinct features. I do however need to be able to see the pictures in real time, so the camera would need some sort of wireless connection to a receiving device such as a phone.  I thought of using an FPV setup as used in drone racing, but the quality and range seems to be quite low, and the strengths of an analog signal seem to be latency and fps, which are both not important to me. It would be nice to have some sort of digital signal to be able to do some editing, such as storing pictures. It would also be cool to connect several cameras to one device.  Are there any solutions to this problem? Would a raspberry pi/arduino setup work in some way? Thanks! C# Unsafe/Fixed Code What exactly do the colors in htop status bars mean? Scala 2.10 + Json serialization and deserialization Enable SSO for Salesforce Marketing Cloud I need to enable Single Sign On for Salesforce Marketing Cloud account where Identity Provider will be a third party and Marketing Cloud will be the Service Provider. I already got SSO Metadata option enabled for my account. I however, need an Entity ID and Federation ID. I am not clear about how to carry the entire process. If anyone of you guys has done SSO enabling for Marketing Cloud, please share steps. Showing $(a^{2}+2)(b^{2}+2)(c^{2}+2)\geq 9(ab+bc+ca)$ Show image in panel I'd like to show an image (png, preferably) in my panel. Does anyone know if this is supported through labels or template_XX UIPanels? rewrite access to collection to avoid "double" finding Why "themselves" and "himself" Consider the vectorspace of all real $m \times n$ vectors and define an    inner product $\langle A,B\rangle = \operatorname{tr}(B^T   A)$.    "tr" stands for "trace"        which is the sum of the diagonal entries of a matrix.   How do you prove that $\operatorname{tr}(B^T   A)$ is indeed a inner product?  Kind regards Asking days badges A couple of months ago, I suggested a set of badges for . The responses were... mixed. The  can be summarized:  In practice, all this would do is encourage people to ask yet more stupid, worthless questions and we have quite enough of that as it is.  We believe that one of the main things holding back many of our beta sites is that when people have questions they aren't in the habit of asking on the site. Even our flagship site, Stack Overflow, doesn't get many questions from its most knowledgeable users. Perhaps they don't have questions, but far more likely they find answers without needing to ask. Our subtle bias against asking (questions =&gt; clueless) means we lose out on what might be our best source of excellent questions. So we went back to the drawing board and designed a badge set that should not encourage worthless questions:  Asked a well-received question on X separate days, and maintained a positive question record.  In order to award badges, we need to define our terms:  positive question record   (total questions - negative questions - closed - deleted)/total questions &gt;= 0.5  It triple counts a question that is downvoted, closed, and deleted. If you ask one that hits that trifecta, you'll need to ask three better questions to dig yourself out. My own record of asking does not meet the criteria:   (44 - 0 - 12 - 12)/44 = 0.4545...  My  looks a lot better; I had a bunch of questions from the beta period that have been subsequently (and rightfully) deleted. With care, I could bring my record into positive territory with 4 questions. The takeaway is that people can't sweep past indiscretions under the rug by deleting them. And they can recover from a bad start as long as they don't ask more bad questions.  well-received question on X separate days A well-received question is one that's open, not deleted, and has a score &gt; 0. If you ask at least one well-received question in a  and none of your questions that day are deleted, downvoted, or closed, you get one more day of credit toward the badge. Whenever the badge criteria is checked, previous asking days are re-evaluated so that there's an incentive to fix downvoted and/or closed questions. The no-deleted-questions criteria is to prevent people from asking several questions at once and deleting any that aren't upvoted or answered to ask another day. (Though this is a losing strategy in the long run.)   My proposed badge names and levels:  Asked a well-received question on 5 separate days, and maintained a positive question record.  Asked a well-received question on 30 separate days, and maintained a positive question record.  Asked a well-received question on 100 separate days, and maintained a positive question record. In addition, since some outstanding individuals ask on more than 100 days, the gold badge may be awarded multiple times. Over on English, Oishi-sama (now a ) would have a remarkable . Bronze and silver badges are only awarded once. We've decided to hold off on multiple awards for now. See the . Neither the names nor the levels nor even the descriptions are set in stone. Please play around with  to get an idea of how the badge works using our public data. Since the query does not account for deleted questions, it's a bit more generous than the actual badges would be. This version of the badge set should encourage a habit of well-received questions over time and encourage people to fix poorly received questions.  I'd like to express my gratitude to the Parenting community for participating in our . Checking host availability by using ping in bash scripts How to remove title entry in the bibliography contents? I use plain bibliography style for my book. When I compile it, by default, I get the details including the title in my reference. like this:     H. J. C. Berendsen, J. P. M. Postma, W. F. van Gunsteren, a. Dinola, and J. R. Haak. Molecular dynamics with coupling to an external bath. J. Chem. Phys., 81:3685-3690,1984.   This is too long and I have more than 100 such references which makes the document too long. How can I force it to remove the title from this reference? something like this:     H. J. C. Berendsen, J. P. M. Postma, W. F. van Gunsteren, a. Dinola, and J. R. Haak.  J. Chem. Phys., 81:3685-3690,1984.   Your answer will be greatly appreciated.  By the way, I still would like to use the plain bibliography style. When should I add another answer? I have been member of SO for 4 months. I have a question regarding some functionality. Whenever I give an answer to a question, there is functionality given Add Another Answer. I can comment on my answer at any time and also able to edit answer. Then   Why this functionality given on SO to add another answer?  When should I add another answer?  Why there is requirement of multiple answers? What is limit of adding answers to single question? Switch statement fallthrough in C#? Switch statement fallthrough is one of my personal major reasons for loving switch vs. if/else if constructs. An example is in order here:  static string NumberToWords(int number) {     string[] numbers = new string[]          { "", "one", "two", "three", "four", "five",            "six", "seven", "eight", "nine" };     string[] tens = new string[]          { "", "", "twenty", "thirty", "forty", "fifty",            "sixty", "seventy", "eighty", "ninety" };     string[] teens = new string[]         { "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen",           "sixteen", "seventeen", "eighteen", "nineteen" };      string ans = "";     switch (number.ToString().Length)     {         case 3:             ans += string.Format("{0} hundred and ", numbers[number / 100]);         case 2:             int t = (number / 10) % 10;             if (t == 1)             {                 ans += teens[number % 10];                 break;             }             else if (t &gt; 1)                 ans += string.Format("{0}-", tens[t]);         case 1:             int o = number % 10;             ans += numbers[o];              break;         default:             throw new ArgumentException("number");     }     return ans; }   The smart people are cringing because the string[]s should be declared outside the function: well, they are, this is just an example.  The compiler fails with the following error:   Control cannot fall through from one case label ('case 3:') to another Control cannot fall through from one case label ('case 2:') to another   Why? And is there any way to get this sort of behaviour without having three ifs? How to change envelope from address using PHP mail? Is there an alternative to string.Replace that is case-insensitive? I need to search a string and replace all occurrences of %FirstName% and %PolicyAmount% with a value pulled from a database. The problem is the capitalization of FirstName varies. That prevents me from using the String.Replace() method. I've seen web pages on the subject that suggest  Regex.Replace(strInput, strToken, strReplaceWith, RegexOptions.IgnoreCase);   However for some reason when I try and replace %PolicyAmount% with $0, the replacement never takes place. I assume that it has something to do with the dollar sign being a reserved character in regex.   Is there another method I can use that doesn't involve sanitizing the input to deal with regex special characters? How do I run two isolated instances of firefox? For testing purposes, I want to install two different instances of firefox on ubuntu - so that they don't share cookies. (I want to simultaneously login with both instances as different users to our website).  How do I do that? I do it with Firefox &amp; Opera, but I prefer Firefox (because of firebug). Is there a way to convert a List(of Object) to a List(of String) in c# or vb.net without iterating through all the items? (Behind the scenes iteration is fine – I just want concise code)  Update: The best way is probably just to do a new select  myList.Select(function(i) i.ToString()).ToList();   or  myList.Select(i =&gt; i.ToString()).ToList();