The first absolute moment for some operators

In this paper we will determinate the first absolute moments for Bernstein, Szász-Mirakjan, Bleimann-Butzer-Hahn, Meyer-König and Zeller operators. For the Szász-Mirakjan operators we give some properties with the absolute moment of high order

Some general Kantorovich type operators

A general class of linear and positive operators of Kantorovich-type is constructed. The operators of this type which preserve exactly two test functions from the set $\{e_0, e_1, e_2\}$ are determined and their approximation properties and convergence theorems are studied