Widths of certain classes of analytic functions in the Hardy space \(H_ 2\)
The main purpose of the paper under review is to compute the diameters of the classes \(W^ r_{\psi}\), \(W^ s_{a,\psi}\) in \(H^ 2\). These classes are defined in terms of the moduli of smoothness.
scientific article; zbMATH DE number 4138121