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Nonlinear Neumann problems for fully nonlinear elliptic PDEs on a quadrant by Ishii, Hitoshi; Kumagai, Taiga is a scholarly article available to read on EtoBox.

What is Nonlinear Neumann problems for fully nonlinear elliptic PDEs on a quadrant about?

We consider the nonlinear Neumann problem for fully nonlinear elliptic PDEs on a quadrant. We establish a comparison theorem for viscosity sub and supersolutions of the nonlinear Neumann problem. The crucial argument in the proof of the comparison theorem is to build a $C^{1,1}$ test function which takes care of the nonlinear Neumann boundary condition. A similar problem has been treated on a general $n$-dimensional orthant by Biswas, Ishii, Subhamay, and Wang [SIAM J. Control Optim. 55 (2017), pp. 365--396], where the functions ($H_i$ in the main text) describing the boundary condition are required to be positively one-homogeneous, and the result in this paper removes the positive homogeneity in two-dimension. An existence result for solutions is also presented.

Author

Ishii, Hitoshi; Kumagai, Taiga

Published

2021

Language

EN