I would like to type something similar to the following:    i.e., a sum of k ones. Is there an easy way to do this in LaTeX?
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I have  $m\times n = n + n + \dots + n$    in my text right now, but I would like to put a curly brace under the \dots to emphasize that there are m,n's involved. How would I do this?
93006
Below you can see an arrow with a plus and a minus sign on top of it. How is this achievable in latex? Further possibilities: arrow with only plus and arrow with only minus sign on top. How can I do this?
98928
Does anyone know how to make (nice looking) double bracket multiset notation in LaTeX. i.e something like (\binom{n}{k}) where there are two outer brackets instead of 1 as in binomial? You can see an example of what I mean in  under the heading "Multiset coefficients" with the double brackets.  In wikpedia they typset it as: \left(\!\!{n\choose k}\!\!\right) but although this works well for LaTeX in maths mode, with inline equations the outer bracket becomes much larger than the inner bracket.  I have also tried using \genfrac{((}{))}{0pt}{}{n}{k} but it has an error with the double brackets.  I am using \binom as well in my document, so I would like the bracket sizes to be similar for \binom and \multiset.  Thanks for any help. I'm surprised I can't find a solution on google.
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I want some advice about how to format it better if I have to write a long text below a $\sum$ or a $\prod$ sign. Basically I want to explain the restriction over which the sum or the product is being taken.   For example how can I improve the looks of these equations,  $N_i (\rho) = \sum _ {B \in \rho s.t n_{\delta_j}(B) = 0    \forall j \neq i} n_{\delta_i} (B)$  $\sum _{ \rho s.t N_i(\rho) = a_i and M_i(\rho) = b_i}    \prod _{B \in \rho} \langle \prod_{i=1}^{n} \delta_i ^{n_{\delta_i}(B)}    y_i ^{n_{y_i}(B)} \rangle_c$
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During my research I noticed different sum signs:     The first one is mine and is created by $\sum_{i=1}^n$. The second one is from a paper. Any idea how to write it in LaTeX?
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Currently, , ,  and  have MathJax support which turns LaTeX code into equation. At least on math, occasionally there are users that do not know this feature or don't know it's possible to use LaTeX (MathJax), resulting a badly formatted post. I suggest that there should be a common &quot;LaTeX/MathJax typesetting help&quot; page for those sites that enabled MathJax support, like the  that is present on all sites. Preferably, there should also be a line  LaTeX equations $\sin^2 \theta$  in the &quot;How to Format&quot; on the right hand side. See also:
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I'm new to LaTex, and would like to create a table that looks as follows:    How can this be done in LaTex?  Thanks.
16405
In LaTeX2e,how can I sum two values and assign them to other variable?  I want to compute something like:   var=\textwidth - 1cm    And if both were constants:   var=1+1
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I'm writing a math paper in LaTeX and for math formulas I'm just using $$math formula$$. Is is possible to numerate formulas? Or do I have to you use some specific commands such as align?
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I was looking for this a while back for JavaScript, but I was wondering a general purpose one exists for all, or most languages.  For example for LaTeX I would put the following in a text box  $f_i^k+10=x$   and it spits out the better formatted version  %%% %% Insert comment describing function here %%% $ f_{i}^{k} + 10 = x $   I can't be the only person on the planet that does not wish to go through a massive .tex file and fix these tedious problems.
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In Matlab I can create a matrix by typing A = [1 2 3; 4 5 6; 7 8 9], for this the space is a delimiter between the entries of the matrix.  I am wondering if there is a package which makes it possible to input a numerical array in a similar way directly into LaTeX?    For example, I would want to use the syntax:  $\SpaceDelimMat[c]{1 2 3; 4 5 6; 7 8 9}$,   instead of typing &amp; (ampersand) 6 times like this:  $\left[\begin{array}[c]{rrr} 1 &amp; 2 &amp; 3\\ 4 &amp; 5 &amp; 6\\ 7 &amp; 8 &amp; 9\end{array}\right]$;   as to do the latter is very time consuming and makes LaTeX document less readable, especially when presenting a course about Matrices.
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Is it possible to modify LaTeX so that good old $$...$$ behaves like \[...\] (and by this I mean that it should be synonymous to it).  If yes: Dear LaTeX3 developer, please integrate this into LaTeX3! (Not that I really believe you will actually do this.)  MWE (even if I don't really see its use in this case):  \documentclass{article}  \begin{document}  I've forgotten we're not in the plain \TeX\ world anymore: $$ x = 3\alpha^2 + \beta   = \int f\, d\mu. $$  \end{document}
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I have the following equation, where there is a lot of stuff under the sum symbol:  \begin{equation} d(\vec{x},\vec{y})=   \sum_{Z_{xy}\in\vec{Z}_{xy},\forall x\in\vec{x},\forall y\in\vec{y}}      f(Z_{xy}) \end{equation}   In the resulting document, I find it kind of hard to read. Is there a way to write the equation to make the result more readable, e.g. putting the stuff under the sum symbol on different lines?
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Like prompt says, I want a command to allow quicker mathematical equations. I have created my own commands in the past but cant figure this out.  Ideally I would end up with a shortcut like \m or Alt+M that would type $$ and then press the left arrow key.    If this cannot be done native to TeXstudio, could someone suggest a good minimalist macro program to make this work?
10523
I know how to do it normally, but I could swear that you could fill out out like a[0] = {0,0,0,0}; How do you do it that way? I did try Google, but I didn't get anything helpful.
39928
I am writing an Article in LaTeX.  Please suggest me how to create a highlight boxes like the ones shown below in LaTeX:
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I am facing problem to write the code of this below picture in my Latex document. kindly guide me about this.