Uniform Approximations by Trigonometric Polynomials - Hardcover

Stepanets, Alexander I.

Hardcover

ISBN 10: 9067643475 ISBN 13: 9789067643474

Publisher: VSP International Science Publishers, 2001

Synopsis

01/07 This title is now available from Walter de Gruyter. Please see www.degruyter.com for more information. The theory of approximation of functions is one of the central branches in mathematical analysis and has been developed over a number of decades. This monograph deals with a series of problems related to one of the directions of the theory, namely, the approximation of periodic functions by trigonometric polynomials generated by linear methods of summation of Fourier series. More specific, the following linear methods are investigated: classical methods of Fourier, Fejér, Riesz, and Roginski. For these methods the so-called Kolmogorov-Nikol’skii problem is considered, which consists of finding exact and asymptotically exact qualities for the upper bounds of deviations of polynomials generated by given linear methods on given classes of 2?-periodic functions. Much attention is also given to the multidimensional case. The material presented in this monograph did not lose its importance since the publication of the Russian edition (1981). Moreover, new material has been added and several corrections were made. In this field of mathematics numerous deep results were obtained, many important and complicated problems were solved, and new methods were developed, which can be extremely useful for many mathematicians. All principle problems considered in this monograph are given in the final form, i.e. in the form of exact asymptotic equalities, and, therefore, retain their importance and interest for a long time.

About this title

Synopsis

The theory of approximation of functions is one of the central branches in mathematical analysis and has been developed over a number of decades. This monograph deals with a series of problems related to one of the directions of the theory, namely, the approximation of periodic functions by trigonometric polynomials generated by linear methods of summation of Fourier series. More specificly, the following linear methods are investigated: classical methods of Fourier, Fejer, Riesz, and Roginski. For these methods the so-called Kolmogorov-Nikol'skii problem is considered, which consists of finding exact and asymptotically exact qualities for the upper bounds of deviations of polynomials generated by given linear methods on given classes of 2-periodic functions. Much attention is also given to the multidimensional case.

Edition details

• Publisher: VSP International Science Publishers
• Publication date: 2001
• Language: English
• ISBN 10: 9067643475
• ISBN 13: 9789067643474
• Binding: Hardcover
• Number of pages: 495