What is the intuition and where should I find proof of this equation (do not know what its name is). It is used to derive Gauss law from Newton equation. $${\nabla \cdot \Bigg ( \frac{\vec{s}}{|\vec{s}|^3}\Bigg)=4\pi \delta^3 (\vec{s})}$$
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See this – Joelafrite Jun 25 '15 at 09:03
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Possible duplicates: https://physics.stackexchange.com/q/75557/2451 , https://physics.stackexchange.com/q/9255/2451 and links therein. – Qmechanic Jun 25 '15 at 09:31