JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, vol.448, no.2, pp.1633-1650, 2017 (SCI-Expanded)
In this work, following a new approach of Baliarsingh (2016) [6], we introduce the concepts of statistically weighted Psi(p,q)(Delta)-summability, weighted Psi(p,q)(Delta)-statistical convergence and weighted strongly Psi(p,q)(Delta)-summability with respect to the difference operatorh Delta(alpha,beta,gamma)(h,p,q) including (p, q)-analogue of Gamma function. Some inclusion,, relations between newly proposed methods are examined. We then prove a Korovkin type approximation theorem for functions of two variables and also present an example via (p, q)-analogue of modified Bernstein-Schurer operators to show that our proposed method is stronger than its classical and weighted statistical versions. Furthermore, we compute the rate of convergence of approximating positive linear operators through the modulus of continuity. Finally, we present computational and geometrical approaches to illustrate some of our results in this paper. (C) 2016 Elsevier Inc. All rights reserved.