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

T_y=\iint_A \tau_{xy}\,dA=0

but it only goes with second integral?

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    \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
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    Of course it does. – Johannes_B Dec 25 '15 at 13:21
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    \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
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    @Johannes_B: Triple integral – user31729 Dec 25 '15 at 13:27
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    @Johannes_B, please convert your comment to answer :-) – Zarko Dec 25 '15 at 13:37

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

\iiint\limits_V \mu(t,u,v,w) \,dt\,du\,dv\,dw \\
T_y=\iint\limits_A \tau_{xy}\,dA=0

enter image description here

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