Bounds on strong unicity for Chebyshev approximation with bounded coefficients
Classical Analysis and ODEs
2021-12-30 v3 Logic
Abstract
We obtain new effective results in best approximation theory, specifically moduli of uniqueness and constants of strong unicity, for the problem of best uniform approximation with bounded coefficients, as first considered by Roulier and Taylor. We make use of techniques from the field of proof mining, as introduced by Kohlenbach in the 1990s. In addition, some bounds are obtained via the Lagrangian interpolation formula as extended through the use of Schur polynomials to cover the case when certain coefficients are restricted to be zero.
Cite
@article{arxiv.1904.10284,
title = {Bounds on strong unicity for Chebyshev approximation with bounded coefficients},
author = {Andrei Sipos},
journal= {arXiv preprint arXiv:1904.10284},
year = {2021}
}