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Global $W^{2,p}$ and $C^{2,α}$ regularity for the sigma-$2$ equation
In this paper, we prove that continuous $2$-convex solutions of the $σ_{2}$ equation with positive continuous density on bounded strictly mean-convex $C^{3}$ domains with $C^{3}$ boundary values belong to $W^{2,p}$ for every $1<p<\infty$ in every dimension. If, in addition, the density is $C^α$, $0<
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