# Using the div-flux theorem (Gauss) to derive divergence in polar coördinates?

#### nonequilibrium

Apparently one can deduce the form of divergence in polar (and spherical) coördinates using the theorem of Gauss and Ostrogradsky, namely that the volume integral over the divergence is equal to the flux integral over the surface. I can't see a way to do that, do you?

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