Maximum-norm estimates for resolvents of elliptic finite element operators |
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Authors: | Nikolai Yu Bakaev Vidar Thomé e Lars B Wahlbin |
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Institution: | Department of Mathematics, Institute of Economics and Business, Berzarina St. 12, Moscow 123298, Russia ; Department of Mathematics, Chalmers University of Technology, S-41296 Göteborg, Sweden ; Department of mathematics, Cornell University, Ithaca New York 14853 |
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Abstract: | Let be a convex domain with smooth boundary in . It has been shown recently that the semigroup generated by the discrete Laplacian for quasi-uniform families of piecewise linear finite element spaces on is analytic with respect to the maximum-norm, uniformly in the mesh-width. This implies a resolvent estimate of standard form in the maximum-norm outside some sector in the right halfplane, and conversely. Here we show directly that such a resolvent estimate holds outside any sector around the positive real axis, with arbitrarily small angle. This is useful in the study of fully discrete approximations based on -stable rational functions, with small. |
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Keywords: | Resolvent estimates maximum-norm elliptic parabolic finite elements |
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