Polynomial Approximation and $ω^r_ϕ(f,t)$ Twenty Years Later

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/138221About twenty years ago the measure of smoothness $ω^r_ϕ(f,t)$ was introduced and related to the rate of polynomial approximation. In this article we survey developments about this and related concepts since that time.Classical Analysis and ODEsFunctional Analysis41A10, 41A17, 41A25, 41A27, 41A30, 41A36, 41A40Polynomial Approximation and $ω^r_ϕ(f,t)$ Twenty Years Latertext