The Second Order Estimate for Fully Nonlinear Uniformly Elliptic Equations without Concavity Assumption

Details The Second Order Estimate for Fully Nonlinear Uniformly Elliptic Equations without Concavity Assumption The Second Order Estimate for Fully Nonlinear Uniformly Elliptic Equations without Concavity Assumption

2005-06-24

arxiv.org/abs/math/0506494v1

Mathematics

Analysis of PDEs

25pages

Scientific paper

Investigating for interior regularity of viscosity solutions to the fully nonlinear elliptic equation $$F(x,u,\triangledown u,\triangledown ^2 u)=0,$$ we establish the interior $C^{1+1}$ continuity under the assumptions that $F$ is uniformly elliptic, H$\ddot o$lder continuous and satisfies the natural structure conditions of fractional order, but without the concavity assumption of $F$. These assumptions are weaker and the result is stronger than that of Caffarelli and Wang[1], Chen[2].

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