Upon compiling, one of my equations extends out of my column width in my final output. Options I tried--

  1. breqn package asks for expl3.sty file which the compiler is unable to locate, (would have been the easiest way in the {dmath} environment
  2. // in the equation,
  3. {split}, {multiline} environment of amsmath but none of the 3 approaches seem to work.

Any tip from your Texperience(!)?

PS: I use latest version of TexnicCenter (+MikTeX 2.9) and the equation is in the {equation} environment right now.

  • MikTeX should automatically install expl3. If not, you can always add it via its package manager.
    – Caramdir
    Commented Aug 6, 2011 at 17:09
  • TeXnicCenter (TXC) has difficulties with automatic package installation. See MiKTeX 2.9 Issues for the details and a possible remedy. Commented Aug 6, 2011 at 17:12
  • I find it odd that // did not work. Are you perhaps using \[ \] for this equation in which case you can't use //? Commented Aug 6, 2011 at 17:26
  • 2
    maybe it is because the correct syntax is \\ ?
    – percusse
    Commented Aug 13, 2011 at 19:21

2 Answers 2


none of the 3 approaches seem to work

That is a bad sentence. Do you get any errors?

Here is an example of the documentation of amsmath with split


 H_c&=\frac{1}{2n} \sum^n_{l=0}(-1)^{l}(n-{l})^{p-2}
     \sum_{l _1+\dots+ l _p=l}\prod^p_{i=1} \binom{n_i}{l _i}\\
    &\quad\cdot[(n-l )-(n_i-l _i)]^{n_i-l _i}\cdot
      \Bigl[(n-l )^2-\sum^p_{j=1}(n_i-l _i)^2\Bigr].


A split equation using amsmath

  • Thanks everyone,have been struggling with it for almost 2 days now, but no success yet. Here are the results of your kind suggestions:@caramdir The pckge mgr shws an eror whle installing expl3 "Unknown archive file size", @Thorsten I am afraid I do not see how to change "MikTex Options",@Peter Yup, // doesn't work, could you pls explain what do you mean by...[ ] for this equation...?@Werner The problem/error I face when I use split is that no pdf output is created. Also for some mysterious reason my error output window has disappeared and can't get it via tools>wind>cmpl reslt. Cheers Commented Aug 6, 2011 at 23:18
  • @Thorsten posted a comment about "Unknown archive file size" of the expl3 package update using MiKTeX Package Manager suggesting that you Syncronize your repository. See/try his answer at the bottom of the link provided.
    – Werner
    Commented Aug 6, 2011 at 23:51
  • @Abhimanyu: Did you include the amsmath package (for split, etc.)?
    – Caramdir
    Commented Aug 7, 2011 at 2:55
  • Is there any way to put the reference number at the bottom of the equation?
    – Moh
    Commented Oct 4, 2013 at 9:52
  • 1
    @MOLi: Yes. Therefore you don't need the environment split. You can work with align and \notag: tex.stackexchange.com/questions/26425/… Commented Oct 4, 2013 at 9:56

This at least compiles and produces output. Removed the extra closing brace in \usepackage{breqn}} and the extra \ in \end{\equation}, and commented out the \begin{comment}, \end{comment} blocks. Plus I think you had some extra blank lines that I removed, and I think the quad was intended to be \quad. Hope this gets you going...


%this equation 1 is ok
%this equation 2 is ok

%to split3
%have commented it out as no pdf output is produced otherwise

%again no output produced when {dmath} environment of breqn used; commented out
%to split4

%to split5
\left|living\_shock_{im}\right|+\gamma_{2}.urbanpop\%_{iy}.\left|living\_shock_{im}    \right|+\delta_{1}.demo_{iy}+\delta_{2}.urbanpop\%_{iy}+\delta_{3}.population+\epsilon_{im}


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