2

I want to assign only one overall subscript that cover the both integral symbols in double integration, I tried:

\begin{equation}
T_y=\iint_A \tau_{xy}\,dA=0
\end{equation} 

but it only goes with second integral?

  • 2
    \documentclass{article} \usepackage{mathtools} \begin{document} \[\iiint\limits_V \mu(t,u,v,w) \,dt\,du\,dv\,dw\] \end{document} – Johannes_B Dec 25 '15 at 13:17
  • 2
    Of course it does. – Johannes_B Dec 25 '15 at 13:21
  • 1
    \documentclass{article} \usepackage{mathtools} \begin{document} \[\iiint\limits_V \mu(t,u,v,w) \,dt\,du\,dv\,dw\] \begin{equation} T_y=\iint\limits_A \tau_{xy}\,dA=0 \end{equation} \end{document} – Johannes_B Dec 25 '15 at 13:22
  • 1
    @Johannes_B: Triple integral – user31729 Dec 25 '15 at 13:27
  • 1
    @Johannes_B, please convert your comment to answer :-) – Zarko Dec 25 '15 at 13:37
5

You can use \limits to accomplish the job. The package mathtools provides good enhancements to the basic features of LaTeX typesetting.

\documentclass{article}
\usepackage{mathtools}
\begin{document}
\begin{gather}
\iiint\limits_V \mu(t,u,v,w) \,dt\,du\,dv\,dw \\
T_y=\iint\limits_A \tau_{xy}\,dA=0
\end{gather} 
\end{document}

enter image description here

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