I don't understand why if $u\in W_0^{1,2}$ I can represent $u$ as $$u(x)=-\frac{1}{2\pi}\int_{B_1(0)}\Delta u(y)\log|x-y|dy$$
2026-05-05 05:48:27.1777960107
Representation Formula in $W_0^{1,2}$
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