Abstract
In this paper, we study the Neumann problem of Monge-Ampère equations in Semi-space. For two dimensional case, we prove that its viscosity convex solutions must be a quadratic polynomial. When the space dimension n≥3, we show that the conclusion still holds if either the boundary value is zero or the viscosity convex solutions restricted on some n−2 dimensional subspace is bounded from above by a quadratic function.
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