1. Mar 16, 2004

### wormhole

i want to prove this equality:

it is trivial to show that it holds for all points outside small certain region around r=0
in this case both sides of equality are 0

i have a dificulty in proving the equality in region r~0

so please give some hint how to attack this thing...

Last edited: Mar 16, 2004
2. Mar 16, 2004

### arildno

Integrate over a region containing r=0 using spherical coordinates