I was trying to post a comment on escaping backslashes, and ran into some formatting issues.  Namely, how to not escape backtick characters, because by default, they are always escaped following a backslash, regardless of the number of backslashes.  (repro'd in comment below)  This is despite the fact that backticks are not escaped in this way in posts: `\` generates \ as expected.   Backticks are tricky, so a workaround may be more useful than a fix. Unless, there are hideously more use cases than just regular expressions and questions about escaping strings?
I've noticed that in comments, when you create `code region` with backticks, the backslash will still work as an escape character within that region (but it should not, IMHO).  To clarify:   In comments, `\\` will be rendered as \, but it should be rendered as \\ In the post body itself, `\\` will be rendered as \\ (i.e., correctly)   This is especially confusing when you enter regular expressions into a comment, since backslash-escaping is very common there, and confusion increases if you are dealing with a regex that is double-escaped for representation in a string.   At some point you lose track how many backslashes you must make so the comment renders correctly, or you don't notice fast enough (or at all) and the comment contains wrong code where the same markup in a question or answer would come out as perfectly correct.   It's just that comments can't be corrected anymore after the grace period, leaving you with the choice of either deleting the comment, thus crippling the conversation, or engaging in a trial-and-error game of writing another comment with even more backslashes to explain the issue.  My question is two-fold:   Will this error be corrected? If yes, existing comments should probably be searched and "fixed" by a routine that tries to do the right thing (this is probably somewhere between hard and impossible) Or, can I rest assured that never ever the behavior of the backslash in comments is going to be changed, so I can start working around this issue by hand, knowing that they won't start displaying incorrectly at some point in the future?
Let $X_1$ and $X_2$ are independent $N(0, \sigma^2)$ random variables. What is the distribution of $X_1^2 + X_2^2$? Let $X_1$ and $X_2$ are independent $N(0, \sigma^2)$ which means (mean = 0, variance = $\sigma^2$) random variables. What is the distribution of $X_1^2 + X_2^2$?  My approach is that  $X_1\sim N(0, \sigma^2)$ and $X_2\sim N(0, \sigma^2)$  Then $X_1^2$ and $X_2^2$ have chi-squared distribution with 1 degree of freedom. (I am not sure the degree of freedom and not sure how to show it as well(please help on this))  Then I found the moment-generating function for $X_1^2$ and $X_2^2$;$$m_{X_1^2} = (1-2t)^{-1/2}$$ and $$m_{X_2^2} = (1-2t)^{-1/2}$$  So the moment generating function for $X_1^2 + X_2^2$ is $$m_{X_1^2}(t) m_{X_2^2}(t) = (1-2t)^{-2/2}$$  So $X_1^2 + X_2^2$ has a chi-squared distribution with 2 degrees of freedom. Is this correct? Given that every class gets a minimum of 5 ability score improvements each at levels 4, 8, 12, 16, and 19 (Rogue and Fighter get more at other levels), do these ability score improvements occur by character level or by class level?  For example, is it possible to create a character who never once gains a single ability score improvement by reaching level 3 in a class and then switching to a different class repeatedly?  I had originally thought the 5 that every class gets would occur by character level, so for example a sorcerer1/bard3 would earn an ability score improvement for reaching character level 4. But there are others who have expressed the opinion that this is wrong. What are some good tutorials on writing custom styles (classes) that clearly explain commands used and some of the features that TeX has to offer in the way of styles? How can one express frequentist p-value in terms of Bayesian concepts? Can I block incoming calls using wildcard patterns? Recently I have been getting a few unwanted telemarketing calls, all coming from the same source. Each number though is different at the end.  For instance, if the numbers to be blocked are:    123-4567 123-7642 123-8643   It would be convenient for the future to simply block with a wildcard, such as:   123-*   Is this at all possible? Router to router setup works fine with straight cable up to 2-3 meter it is not working for 45 meter why? Prove that the only automorphism of $\mathbb{Q}(\sqrt[3]{2})$ is the identity automorphism. I am having difficulty with this proof. I have previously proved that for an automorphism on the extension field $K$ of $F$ that when restricted to $F$ is the identity automorphism must take roots of $f(x)\in F[x]$ in $E$ to roots of $f(x)$ in $E$. I was thinking of using the minimal polynomial $x^{3}-2\in\mathbb{Q}[x]$ and the result of previous problem I solved, but I suspect there are automorphisms that don't fix the subfield, so the result can't be used or I need to prove that any automorphism of an extension field must fix the subfield that is being extended or always sends roots in $E$ to roots in $E$.  I am not asking for a solution to this, but maybe a hint or pointer in the right direction. This problem is introduced in the text prior to Galois theory, so please keep that in consideration. Slovak (and Czech) babel gives problems with cmidrule and cline I tried to use the Slovak language with the booktabs package.    Let's see a couple of cases.   slovak is included in the options to babel     \usepackage[english,slovak]{babel}   or    \usepackage[slovak,english]{babel}   or    \usepackage[slovak]{babel}`  "slovak" is NOT included in the options to babel  \usepackage[english]{babel}    Similarly two cases for \cmidrule  A. \cmidrule{2-3} is included in the table    B. \cmidrule{2-3} is NOT included in the table    If both (slovak+\cmidrule) are included (case 1A), then following error occurrs  Paragraph ended before \@@@cmidrule was complete   (and a lot of other errors)  In the other cases (1B, 2A and 2B) (NO slovak or NO \cmidrule), then pdflatex is succesful  Does anybody know why 1A is wrong?    And how to use slovak and \cmidrule together (case 1A)?  \documentclass[10pt]{book} \usepackage[english,slovak]{babel} \usepackage{booktabs}  \begin{document}  \begin{tabular}{ccc} A &amp; B &amp; C \\ %\cmidrule{2-3} A &amp; B &amp; C \\ \end{tabular}  \end{document}   I have Win7, TeXstudio 2.5.2 How to determine $\int x^2 e^{-x^2}\mathrm dx$? I was wondering how to determine $$\int x^2 e^{-x^2}\mathrm dx?$$ I tried to move the exponential into the integrator, and apply integration by parts, but that will make the integrand more complicated. Thank you! How can I SELECT rows with MAX(Column value), PARTITION by another column in MYSQL? Looking to achieve frame effect with shadows at corners How to find out what's accessing a particular hard drive on Windows? Possible Duplicate:          My HDD on a dock just started making noises like it's being accessed but I don't see any program accessing it.  Is there a program that shows which HDD is accessed by which program in percentages similar to how the task manager shows which programs use the most CPU? GIS Point or discrete longitude and latitude columns? I see that the Point type is made to store geometric coordinates, however I don't see what problem it is trying to solve, or what advantages it offers over simply using two numerical columns. It's 16 bytes, so is it just an abstraction for two 8 byte floats? Or is it a string containing some kind of geohash that optimizes the performance of certain queries?  Let's say I want to get all the points for a specific viewport on a Leaflet map... with numerical columns representing latitude and longitude, I'd just filter for all the rows that have a latitude number between the N/S bounds and a longitude number between the E/W bounds, easy. I looked into using Point here, but the syntax is cumbersome and it seems to me like unnecessary overhead for development and for database performance... is it? Show $4x^2+6x+3$ is a unit in $\mathbb{Z}_8[x]$ (inverting unit + nilpotent) Show that $4x^2+6x+3$ is a unit in $\mathbb{Z}_8[x]$.  Once you have found the inverse like , the verification is trivial. But how do you come up with such an inverse. Do I just try with general polynomials of all degrees and see what restrictions RHS = $1$ imposes on the coefficients until I get lucky? Also is there a general method to show an element in a ring is a unit? Computing $\lim_{n\rightarrow \infty} \frac{1+\sqrt{2}+\sqrt[3]{3}+\cdots+\sqrt[n]{n}}{n}$. I have a problem with the calculation of the following limit. \begin{equation} \lim_{n\rightarrow \infty} \frac{1+\sqrt{2}+\sqrt[3]{3}+\cdots+\sqrt[n]{n}}{n} \end{equation} I do not know where to start! Thank you very much I understand what the Chinese remainder theorem is. However I am not sure how to apply it to my question. Can someone explain please? Software to synchronize two directories (local/remote) I need software that would detect changes in directory (A) every 5 seconds or so and upload/delete changed files from/at (B) remote directory.  I found non-commercial software, . I am wondering if there are any commercial alternatives? How can I tell if two Minecraft mods are compatible? If I want to use two mods together, e.g.  and  (which don't state compatibility with one another), how can I tell if they will work together (and not break Minecraft - forcing me to re-download a fresh copy)? Is the Ministry of Magic unable to detect illegal time-tampering? Since Hermione already admitted that they were breaking the Law. Would it be safe to conclude that the Ministry cannot instantly (by magic) detect illegal time-tampering?  (Both before and during the events of Prisoner of Azkaban.)     “Hermione,” said Harry suddenly, “what if we — we just run in    there and grab Pettigrew —”       “No!” said Hermione in a terrified whisper. “Don’t you understand?    We’re breaking one of the most important wizarding laws!    Nobody’s supposed to change time, nobody! You heard Dumbledore,    if we’re seen —”       — Prisoner of Azkaban, chapter 21 (Hermione’s Secret) I have a table to store StudentID, SubjectID, ObtainedMarks. Now I have to create a pivot table to show studentID and obtainedMarks in different subject. Number of subject may differ. I could generate pivot table for fixed subjectID like    SELECT * FROM (SELECT StudentID, SubjectID, ObtainedMarks from [Exam].[ObtainedMarkEntry]) as InvoiceResult PIVOT (     sum(ObtainedMarks) for [SubjectID] in  ([1],[2],[3],[4]) )as finalResult   This works but problem is 1,2,3 is not static it should come from same table   So I did something like   declare @minvalue int, @maxvalue int declare @myArray varchar(max) set @MyArray=''  select RowID=IDENTITY(int, 1,1), SubjectID into #tempSubject from [Exam].[ObtainedMarkEntry] select * from #tempSubject set @minvalue = (select min(RowID) from #tempSubject) set @maxvalue = (select max(RowID) from #tempSubject) while (@minvalue&lt;=@maxvalue) begin     declare @sid nvarchar(10)     set @sid=(select SubjectID from #tempSubject where RowID=@minvalue)     set @myArray= @myArray + '[' + @sid + '], '      set @minvalue= @minvalue+1 end set @myArray= SUBSTRING(@myArray,0,len(@myArray)) drop table #tempSubject  declare @q as nvarchar(max) SELECT * FROM (SELECT StudentID, SubjectID, ObtainedMarks  from [Exam].[ObtainedMarkEntry]) as InvoiceResult PIVOT (     sum(ObtainedMarks) for [SubjectID] in  (@myArray) )as finalResult   Now I am getting error at in(@myArray) can't I assign variable in this section.