"Push-the-Error" Algorithm for Nonlinear n-Term Approximation |
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Authors: | W Dahmen P Petrushev |
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Institution: | (1) Institut fur Geometrie und Praktische Mathematik, RWTH Aachen, Templergraben 55, 52056 Aachen, Germany;(2) Department of Mathematics, University of South Carolina, Columbia, SC 29208, USA |
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Abstract: | This paper is concerned with further developing and refining the analysis of a recent algorithmic paradigm for nonlinear approximation,
termed the
"Push-the-Error" scheme. It is especially designed to deal with L∞-approximation in a multilevel framework. The original version is extended considerably to cover all commonly used multiresolution
frameworks. The main conceptually new result is the proof of the quasi-semi-additivity of the functional N(ε) counting the
number of terms needed to achieve accuracy ε. This allows one to show that the improved scheme captures all rates of best
n-term approximation. |
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Keywords: | Uniform norm approximation Multilevel expansions Wavelet bases Best n-term approximation |
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