Authors: J Guzmán D Leykekhman J Rossmann A H Schatz
Publish Date: 2009/01/30
Volume: 112, Issue: 2, Pages: 221-243
Abstract
A model secondorder elliptic equation on a general convex polyhedral domain in three dimensions is considered The aim of this paper is twofold First sharp Hölder estimates for the corresponding Green’s function are obtained As an applications of these estimates to finite element methods we show the best approximation property of the error in W1 infty In contrast to previously known results W p2 regularity for p 3 which does not hold for general convex polyhedral domains is not required Furthermore the new Green’s function estimates allow us to obtain localized error estimates at a point
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