Regular Article
Local and Global Approximation Theorems for Positive Linear Operators

https://doi.org/10.1006/jath.1998.3212Get rights and content
Under an Elsevier user license
open archive

Abstract

In this paper we bridge local and global approximation theorems for positive linear operators via Ditzian–Totik moduliω2φ(f, δ) of second order whereby the step-weightsφare functions whose squares are concave. Both direct and converse theorems are derived. In particular we investigate the situation for exponential-type and Bernstein-type operators.

Cited by (0)

Communicated by Doron, S. Lubinsky

f1

E-mail: [email protected]