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Optimal Approximation of Elliptic Problems by Linear and Nonlinear Mappings II

Stephan Dahlke, Erich Novak, Winfried Sickel

math.NAarXiv:math/0606503

Abstract

We study the optimal approximation of the solution of an operator equation Au=f by linear and nonlinear mappings. We identify those cases where optimal nonlinear approximation is better than optimal linear approximation.

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