Algorithms for nonlinear piecewise polynomial approximation: Theoretical aspects
Authors:
Borislav Karaivanov, Pencho Petrushev and Robert C. Sharpley
Journal:
Trans. Amer. Math. Soc. 355 (2003), 25852631
MSC (2000):
Primary 41A17, 41A25, 65D18; Secondary 65D07, 42B35
Published electronically:
March 19, 2003
MathSciNet review:
1975391
Fulltext PDF Free Access
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Abstract: In this article algorithms are developed for nonlinear term Courant element approximation of functions in ( ) on bounded polygonal domains in . Redundant collections of Courant elements, which are generated by multilevel nested triangulations allowing arbitrarily sharp angles, are investigated. Scalable algorithms are derived for nonlinear approximation which both capture the rate of the best approximation and provide the basis for numerical implementation. Simple thresholding criteria enable approximation of a target function to optimally high asymptotic rates which are determined and automatically achieved by the inherent smoothness of . The algorithms provide direct approximation estimates and permit utilization of the general JacksonBernstein machinery to characterize term Courant element approximation in terms of a scale of smoothness spaces (spaces) which govern the approximation rates.
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Additional Information
Borislav Karaivanov
Affiliation:
Department of Mathematics, University of South Carolina, Columbia, South Carolina 29208
Email:
karaivan@math.sc.edu
Pencho Petrushev
Affiliation:
Department of Mathematics, University of South Carolina, Columbia, South Carolina 29208
Email:
pencho@math.sc.edu
Robert C. Sharpley
Affiliation:
Department of Mathematics, University of South Carolina, Columbia, South Carolina 29208
Email:
sharpley@math.sc.edu
DOI:
http://dx.doi.org/10.1090/S0002994703031416
PII:
S 00029947(03)031416
Keywords:
Nested irregular triangulations,
redundant representations,
nonlinear $n$term approximation,
Courant elements,
Jackson and Bernstein estimates.
Received by editor(s):
May 2, 2002
Published electronically:
March 19, 2003
Additional Notes:
The second and third authors were supported in part by Grant NSF #DMS0079549 and ONR N000140110515.
All three authors were supported in part by ONR grant N000140010470.
Article copyright:
© Copyright 2003
American Mathematical Society
