I want a convincing proof of this...
\nabla^2 (1/|r-r'|) = -4\pi \delta^3 (r-r')
(where r and r' are vectors and \delta^3 (r-r') represents the 3-D delta function...)
I want a convincing proof of this...
\nabla^2 (1/|r-r'|) = -4\pi \delta^3 (r-r')
(where r and r' are vectors and \delta^3 (r-r') represents the 3-D delta function...)