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I would like to place a lower limit under two consecutive \sums, somewhere in between. So I have \sum_{j=1}^{\infty}\sum_{k=1}^{\infty} and would like to place j>k in the lower limit between the two sums. I believe the multiple integral operator has this kind of functionality.

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Wouldn't \sum_{j=1}^{\infty}\sum_{k=1}^{j} do? –  Caramdir Aug 7 '11 at 2:52
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2 Answers

up vote 19 down vote accepted

Something like:

\mathop{\sum_{j=1}^{\infty}\sum_{k=1}^{\infty}}_{j>k}

maybe?

Looks like this:

enter image description here

Or if you want it on the same line as j=1 and k=1, then maybe:

\mathop{\sum^{\infty}\sum^{\infty}}_{j=1\ j>k\ k=1}

enter image description here

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Thanks! The first is exactly what I was looking for. –  asar Aug 7 '11 at 2:42
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There is an equivalent alternative.

\documentclass[11pt]{article}
\usepackage[T1]{fontenc}
\usepackage{mathtools}

\begin{document}
  \[
    \underset{j>k}{\sum_{j=1}^{\infty}\sum_{k=1}^{\infty}}
  \]
\end{document}
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