Approximation with Chlodowsky–Sheffer Operators on Unbounded Intervals

Özarslan M. A., ÇEKİM B., ÇİT S.

Mediterranean Journal of Mathematics, vol.22, no.8, 2025 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 22 Issue: 8
  • Publication Date: 2025
  • Doi Number: 10.1007/s00009-025-02970-8
  • Journal Name: Mediterranean Journal of Mathematics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, MathSciNet, zbMATH, DIALNET
  • Keywords: Chlodowsky–Sheffer operators, modulus of continuity, Peetre’s κ-functional, Sheffer polynomials
  • Gazi University Affiliated: Yes

Abstract

In this paper, we introduce some operators based on binomial operators involving Sheffer polynomials, which allows us to approximate continuous functions on unbounded intervals. We investigate the approximation properties of the operators in weighted spaces. With the help of the first and second modulus of continuity, we obtain the degree of approximation of continuous functions using Petree’s κ-functional. We also find the approximation degree for functions of the modified Lipschitz class. Eventually, according to the choices of the generating function ht, the operator includes Laguerre-type, Bell-type, and Chlodowsky-type operators in special cases. We illustrate the approximation of these special cases for some functions. Finally, we give the generalization of the operator.