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In the present paper, we study the rate of convergence of Szász type and Kantorovich-Szász type operators involving Sheffer polynomials with the help of modulus of continuity and examine these type operators including reverse Bessel polynomials which are Sheffer type. Furthermore, we compute error estimation for a function f by operators containing reverse Bessel polynomials.

Mathematics Subject Classification (2010): 41A25, 41A35.

Keywords: Szász operator, Rate of convergence, Sheffer polynomials, Bessel polynomials, Modulus of continuity.