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My tex

\begin{equation}
 \iint \limits_{-\infty}^{+\infty} 
\end{equation}

It looks like

enter image description here

I want two limits there above and below.

How can you have two limits above and below the two integrals?

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How 'bout just using \int twice? –  Steven B. Segletes Dec 5 '13 at 14:44

1 Answer 1

up vote 4 down vote accepted

You are probably expecting iterated integral, not double integral. Hence

\documentclass{article}

\begin{document} 

\newcommand{\Int}{\int\limits}

\begin{equation}
\Int_{-\infty}^{+\infty} \Int_{-\infty}^{+\infty}f(x,y) \,dxdy
\end{equation}

\end{document}

enter image description here

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