Generalization of Sz\'{a}sz operators involving multiple Sheffer polynomials

The present work deals with the mathematical investigation of some generalizations of the Sz'{a}sz operators. In this work, the multiple Sheffer polynomials are introduced. The generalization of Sz'{a}sz operators involving multiple Sheffer polynomials are considered. Convergence properties of these operators are verified with the help of the universal Korovkin-type property and the order of approximation is calculated by using classical modulus of continuity. The theoretical results are exemplified choosing the special cases of multiple Sheffer polynomials.