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In my vector calculus class my lecturer was showing that the laplacian of 1/r is zero. He further said that since 1/r and its derivatives are not defined at the origin we state that the Laplacian of 1/r is zero for all values of r not equal to zero. He then says that this caveat is extremely important in advanced courses.

Can someone please tell me in what sort of courses this is important, and if possible why ?

Cheers,

Thrillhouse

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# Laplacian of 1/r is zero at orign

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