A Survey of Weighted Approximation for Exponential Weights

Details A Survey of Weighted Approximation for Exponential Weights A Survey of Weighted Approximation for Exponential Weights

2007-01-03

arxiv.org/abs/math/0701099v1

Surveys in Approximation Theory, 3(2007), 1-105

Mathematics

Classical Analysis and ODEs

105 pages

Scientific paper

Let W: R to (0,1] be continuous. Bernstein's approximation problem, posed in 1924, deals with approximation by polynomials in the weighted uniform norm ||fW|| Linfinity(R) . The qualitative form of this problem was solved by Achieser, Mergelyan, and Pollard, in the 1950's. Quantitative forms of the problem were actively investigated starting from the 1960's. We survey old and recent aspects of this topic, including the Bernstein problem, weighted Jackson and Bernstein Theorems, Markov-Bernstein and Nikolskii inequalities, orthogonal expansions and Lagrange interpolation. We present the main ideas used in many of the proofs, and different techniques of proof, though not the full proofs. The class of weights we consider is typically even, and supported on the whole real line, so we exclude Laguerre type weights on [0,infinity). Nor do we discuss Saff's weighted approximation problem, nor the asymptotics of orthogonal polynomials.

Affiliated with

Also associated with

No associations

Rating

A Survey of Weighted Approximation for Exponential Weights does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A Survey of Weighted Approximation for Exponential Weights, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Survey of Weighted Approximation for Exponential Weights will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-564023