This book is intended as a self-contained introduction for non-specialists, or as a reference work for experts, to the particular area of approximation theory t

The key point of the monograph is the classification of periodic functions introduced by the author and developed methods that enable one to solve, within the f

The series is devoted to the publication of monographs and high-level textbooks in mathematics, mathematical methods and their applications. Apart from covering

This book contains an exposition of several results related with direct and converse theorems in the theory of approximation by algebraic polynomials in a finit