Exact constants in approximation theory
By: N. Korneichuk ; translated from the Russian by K. Ivanov.
Series: Encyclopedia of mathematics and its applications
Publisher: Cambridge University Press
Published: 1991
Place of publication: Cambridge; New York
Language: eng
Number of pages: 452
Subjects: Approximation theory.
Description: 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 that is concerned with exact constants. The results apply mainly to extremal problems in approximation theory, which in turn are closely related to numerical analysis and optimization. The book encompasses a wide range of questions and problems: best approximation by polynomials and splines; linear approximation methods, such as spline-approximation; optimal reconstruction of functions and linear functionals. Many of the results are based on deep facts from analysis and function theory, such as duality theory and comparison theorems; these are presented in chapters 1 and 3. In keeping with the author's intention to make the book as self-contained as possible, chapter 2 contains an introduction to polynomial and spline approximation. Chapters 4 to 7 apply the theory to specific classes of functions. The last chapter deals with n-widths and generalises some of the ideas of the earlier chapters. Each chapter concludes with commentary, exercises and extensions of results. A substantial bibliography is included. Many of the results collected here have not been gathered together in book form before, so it will be essential reading for approximation theorists.
Notes: Includes bibliographical references (p. 426-449) and index.
Translation of: Tochnye konstanty v teorii priblizhenii͡a︡.