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Please see this pdf at some universities website:

http://physics.ucsc.edu/~peter/110A/helmholtz.pdf

In line 14 the author claims using integration by parts...I do not understand

who could the integration by parts be used here.

I understand the general case where we have der(a*b)=a der(b) + b der(a)

but I am not able to see how this happened here..

Thanks!

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# How a vol. integral becomes a vol. integral plus surface integral

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