Strong Converse Inequalities and Qantitative Voronovskaya-Type Theorems for Trigonometric Fej\'er Sums

Jorge BUSTAMANTE, Lázaro FLORES DE JESÚS

The Product of Two Functions Using Positive Linear Operators

Adrian HOLHOŞ

On a Family of Hypergeometric Sobolev Orthogonal Polynomials on the Unit Circle

Sergey ZAGORODNYUK

Gneiting Class, Semi-Metric Spaces and Isometric Embeddings

Valdir MENEGATTO, Claudemir OLİVEİRA, Emilio PORCU

A Note on the Stability of Some Functional Equations on Certain Groupoids

Jedsada SENASUKH, Satit SAEJUNG