Calculating Integrals with Gauss's Theorem

[matematikuvol]

\oint_S \vec{A}\cdot d\vec{S}=\int_V div\vec{A}dv

Suppose region where \vec{A}(\vec{r}) is diferentiable everywhere except in region which is given in the picture. Around this region is surface S'. In this case Gauss theorem leads us to

\int_S \vec{A}\cdot d\vec{S}+\int_S \vec{A}\cdot d\vec{S}=\int_{V'} divAdv

Am I right?

 

[matematikuvol]

Here is the picture

 

[HallsofIvy]

Well, what you wrote is not correct because you have "S" on both integrals and I suspect you want "S' " on one. But even then it not correct- you need to subtract not add:
\int_S \vec{A}\cdot\vec{dS}- \int_{S'} \vec{A}\cdot\vec{dS}= \int_V div \vec{A}dV