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Yasheng Lyu

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Preprint Oct 2026

On the Dirichlet problem for the degenerate $2$-Hessian equation

In this paper, we establish global $C^{1,1}$ solvability of the Dirichlet problem for the degenerate $2$-Hessian equation on bounded strictly mean convex $C^{3,1}$ domains $\Omega$, with general $C^{3,1}$ boundary values and nonnegative right-hand sides $f\in C^{1,1}(\overline{\Omega})$, resolving the $k=2$ case of a l...

Yasheng Lyu · 0 citations
Preprint Sep 2026

Global $W^{2,p}$ and $C^{2,\alpha}$ regularity for the sigma-$2$ equation

In this paper, we prove that continuous $2$-convex solutions of the $\sigma_{2}$ 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 $C^{\alpha}$, $0<\alpha<1...

Yasheng Lyu · 0 citations
Preprint Sep 2026

Interior $W^{2,p}$ regularity for the sigma-$2$ equation

We prove that continuous $2$-convex solutions of the $\sigma_{2}$ equation with a density bounded above and below by positive constants belong to $W^{2,1}_{\mathrm{loc}}$ in every dimension. If, in addition, the density is continuous, the solutions belong to $W^{2,p}_{\mathrm{loc}}$ for every $1

Yasheng Lyu · 1 citation

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