Mean convergence of interpolatory processes on an arbitrary system of nodes
Necessary conditions for mean convergence of Lagrange and Hermite-Fejér interpolation on an arbitrary system of nodes are given, which provides partial answers to Problem 11 of \textit{P. Turán} [J. Approximation Theory 29, 23-85 (1980; Zbl 0454.41001)].
scientific article; zbMATH DE number 878113