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Pointwise Remez inequality

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
<mark>Journal publication date</mark>31/12/2021
<mark>Journal</mark> Constructive Approximation
Issue number3
Volume54
Number of pages26
Pages (from-to)529-554
Publication StatusPublished
Early online date8/11/21
<mark>Original language</mark>English

Abstract

The standard well-known Remez inequality gives an upper estimate of the values of polynomials on [- 1 , 1] if they are bounded by 1 on a subset of [- 1 , 1] of fixed Lebesgue measure. The extremal solution is given by the rescaled Chebyshev polynomials for one interval. Andrievskii asked about the maximal value of polynomials at a fixed point, if they are again bounded by 1 on a set of fixed size. We show that the extremal polynomials are either Chebyshev (one interval) or Akhiezer polynomials (two intervals) and prove Totik–Widom bounds for the extremal value, thereby providing a complete asymptotic solution to the Andrievskii problem.

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Publisher Copyright: © 2021, The Author(s).