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The divergence theorem can be stated as

$$\bigcirc \hspace{-1.3em} \int \hspace{-.8em} \int\limits_{\partial\Omega} dA\,n_i = \iiint\limits_\Omega dV\partial_i$$

applied to an arbitrary function (usually a vector valued field) where $\partial\Omega$ is the closed surface of the volume $\Omega\subset\mathbb{R}^3$ and $n_i$ is the $i$th component of the surface normal vector $\vec n$.

Is there a similar correspondence between e.g.

$$\bigcirc \hspace{-1.3em} \int \hspace{-.8em} \int\limits_{\partial\Omega} dA\,n_i n_j$$

and another volume integral?

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    @Matt thanks, I tried `\oiint` but didn't think `\oint` would work instead...2012-09-04
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    That's ok, I was just curious and the result turned out ok. Somebody probably knows how to center the limit properly as well.2012-09-04
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    @MattPressland I found a nice `\oiint` [here](http://www.scribd.com/doc/17706782/115/A-new-oiint-command)2012-09-05
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    That looks better! (I didn't actually realise the circle was supposed to go through both integrals).2012-09-05

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