Green's function

Green's function for the Laplacian

A Green's function for the Laplacian is given by

𝐺(⃗𝐫−⃗𝐫′)=−14𝜋𝔯

where 𝔯 =‖⃗𝐫 −⃗𝐫′‖ which satisfies

∇2𝐺(⃗𝐫−⃗𝐫′)=𝛿3(⃗𝐫−⃗𝐫′)
Proof

#missing/proof

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