Approximation operators constructed by means of Sheffer sequences

In this paper we introduce a class of positive linear operators by using the "umbral calculus", and we study some approximation properties of it. Let \( Q \) be a delta operator, and \(S\) an invertible shift invariant operator. For \(f\in C[0,1]\) we define \begin{equation*} (L_{n}^{Q,S}f)(x)= {\te... View More