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Let $s\in(0,1)$, let $u\in H^s(\mathbb{R}^n)$. For all $\psi\in\mathcal{S}(\mathbb{R}^n)$, let: $$ (-\Delta)^s\psi(x)=c(n,s)\lim_{\epsilon\to0^+} \int_{\mathbb{R}^n\setminus B_\epsilon(0)}\frac{\psi(...