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math.AP2001★ 9 cited
Two symmetry problems in potential theory
Tewodros Amdeberhan
We consider two eliiptic overdetermined boundary value problems. There are variants on J. Serrin's 1971 classical results and having the same conclusion that the domains should be…
math.AP1998
Maximum principles for a class of nonlinear second order elliptic differential equations
Giovanni Porru, Tewodros Amdeberhan, S. Vernier-Piro
In this paper we investigate maximum principles for functionals defined on solutions to special partial differential equations of elliptic type, extending results by Payne and Phil…