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Andrey Rekalo
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regularity for fractional laplace equation

Hey, I want to know what is the best interior regularity of the following equaiton:

$(-\Delta)^{\frac{s}{2}}u=f$ in $B_{1}$ (ball with radius 1, centered at 0) $f\in L^{\infty}(B_{\frac{1}{2}})$

thanks