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I am writing a paper about some numerical methods in the field of electrostatics and I remember from somewhere that the following equation is true: $$\left(
\frac{\partial^2}{\partial x^2}
+
\frac{\partial^2}{\partial y^2}
\right)
\log{\left(x^2+y^2\right)^{\frac{1}{2}}}
=
2\pi\delta(x)\delta(y)...
