I'm trying to get information to appear above and below a math symbol such as \sum or \leftrightarrows. I've found information detailing \mathop and the syntax behind it but when I try to use it, it appears my tex editor doesn't recognize it as a command. Is mathop not in the ams math package?

I'm a relatively new latex user so any help would be appreciated.

The tutorial I'm following is http://truonglatex.wordpress.com/2010/04/13/arrows-and-stack-math-symbols/

My output looks as the attached image. The code is identical to the one on the website. My output

Thanks any help would be appreciated.

  • \sum\limits...
    – user11232
    Commented Nov 12, 2014 at 1:34
  • The user guide of the amsmath package may be opened by typing texdoc amsmath at a command prompt. The macro \mathop (note the initial backslash character)` is built into TeX's language; it's not provided by the amsmath package.
    – Mico
    Commented Nov 12, 2014 at 6:44

1 Answer 1


Without MWE (Minimal Working Example) we can guess, how you used the code, but we cannot, how you want to, hence two cases.



You have

a\mathop{\sum\sum\sum}_{a=\frac12}^{\text{some text}}b 

You want to

a\mathop{\sum\sum\sum}_{a=\frac12}^{\text{some text}}b 

If you want it in inline mode, use \verb+\limits+
a\mathop{\sum\sum\sum}\limits_{a=\frac12}^{\text{some text}}b 


enter image description here

  • Thanks a lot for the speedy response. That's exactly what I needed! Cheers. Commented Nov 12, 2014 at 2:22

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