Japan Journal of Applied Mathematics

, 1:173

Some results of bernstein and jackson type for polynomial approximation inLp-spaces

Authors

  • Alfio Quarteroni
    • Istituto di Analisi Numerica del C.N.R.
Article

DOI: 10.1007/BF03167866

Cite this article as:
Quarteroni, A. Japan J. Appl. Math. (1984) 1: 173. doi:10.1007/BF03167866

Abstract

This work is motivated by the analysis of stability and convergence of spectral methods using Chebyshev and Legendre polynomials. We investigate the properties of the polynomial approximation to a functionu in the norms of the weightedLwp (−1, 1) spaces.p is any real number between 1 and ∞, andw(x) is either the Chebyshev or the Legendre weight. The estimates are given in terms of the degreeN of the polynomials and of the smoothness ofu. They include and generalize some theorems of Jackson. Some Bernstein-type inequalities are also given.

Key words

Chebyshev and Legendre approximationsBernstein and Jackson inequalitiesanalysis of spectral methods

Copyright information

© JJAM Publishing Committee 1984