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Mathematics Research Report MRR95-034

On The Existence Of Lipschitz Barriers For Quasilinear Elliptic Equations

Timothy R. Cranny

Abstract: It is well-known that quasilinear elliptic PDE's permit the exitence of Lipschitz barriers for arbitrary Dirichlet boundary data only under certain restrictions upon the behaviour of the differential operator for large gradient. We present here a simple proof that a sufficiently tight bound on the supremum norm of solutions ensures the existence of Lipschitz barriers even when these restrictions are substantially weakened.


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