## Journals

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### Open Access Journals

DCDS

In this paper we prove the existence of classical solutions to near field reflector problems, both for a point light source and for a parallel light source, with planar receivers. These problems involve Monge-Ampère type equations, subject to nonlinear oblique boundary conditions. Our approach builds on earlier work in the optimal transportation case by Trudinger and Wang and makes use of a recent extension of degree theory to oblique boundary conditions by Li, Liu and Nguyen.

DCDS

This paper treats quasilinear elliptic equations in
divergence form whose inhomogeneous term is a signed measure. We
first prove the existence and continuity of generalized solutions to
the Dirichlet problem. The main result of this paper is a weak
convergence result, extending previous work of the authors for
subharmonic functions and non-negative measures. We also prove a
uniqueness result for uniformly elliptic operators and for operators
of $p$-Laplacian type.

DCDS

In this paper, we prove interior second derivative estimates of Pogorelov type for a general form of Monge-Ampère equation which includes the optimal transportation equation. The estimate extends that in a previous work with Xu-Jia Wang and assumes only that the matrix function in the equation is regular with respect to the gradient variables, that is it satisfies a weak form of the condition introduced previously by Ma,Trudinger and Wang for regularity of optimal transport mappings. We also indicate briefly an application to optimal transportation.

DCDS

We develop the fundamentals of a local regularity theory for prescribed Jacobian equations which
extend the corresponding results for optimal transportation equations. In this theory the cost function is extended to a

*generating function*through dependence on an additional scalar variable. In particular we recover in this generality the local regularity theory for potentials of Ma, Trudinger and Wang, along with the subsequent development of the underlying convexity theory.## Year of publication

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