On uniform approximation by some classical Bernstein-type operators

JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS

卷:279

Article

de la Cal, J ; Cárcamo, J

关键词: Bernstein-type operators;    Szasz operators;    Szasz-Durrmeyer operators;    gamma operators;    Baskakov;    operators;    Meyer-Konig and Zeller operators;    Cheney and Sharma operators;    uniform convergence;    rate of convergence;    modulus of continuity;    Poisson distribution;    gamma distribution;    negative binomial distribution;    Poisson processes;    gamma processes;   

DOI  :  10.1016/S0022-247X(03)00048-9

来源: Elsevier

【 摘 要 】

We investigate the functions for which certain classical families of operators of probabilistic type over noncompact intervals provide uniform approximation on the whole interval. The discussed examples include the Szasz operators, the Szasz-Durrmeyer operators, the gamma operators, the Baskakov operators, and the Meyer-Konig and Zeller operators. We show that some results of Totik remain valid for unbounded functions, at the same time that we give simple rates of convergence in terms of the usual modulus of continuity. We also show by a counterexample that the result for Meyer-Konig and Zeller operators does not extend to Cheney and Sharma operators. (C) 2003 Elsevier Science (USA). All rights reserved.

【 授权许可】

Free