Bounds on strong unicity for Chebyshev approximation with bounded coefficients. Issue 12 (28th December 2021)

• Record Type: Journal Article
• Authors: Sipoş, Andrei
• Is Part Of: Mathematische Nachrichten. Volume 294:Issue 12(2021)
• Page Start: 2425
• Page End: 2440
• Publication Date: 2021-12-28
• Subjects: Chebyshev approximation -- modulus of uniqueness -- proof mining -- Schur polynomials -- strong uniqueness -- Young tableaux; Mathematics -- Periodicals; 510.5
• DOI: 10.1002/mana.201900439
• Languages: English
• ISSNs: 0025-584X

Abstract

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.