Sharp estimates for solutions to elliptic problems with mixed boundary conditions
Abstract
We show, using symmetrization techniques, that it is possible to prove a comparison principle (we are mainly focused on L1 comparison) between solutions to an elliptic partial differential equation on a smooth bounded set with a rather general boundary condition, and solutions to a suitable related problem defined on a ball having the same volume as . This includes for instance mixed problems where Dirichlet boundary conditions are prescribed on part of the boundary, while Robin boundary conditions are prescribed on its complement.
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