tailieunhanh - Báo cáo hóa học: " Research Article Exact Values of Bernstein n-Widths for Some Classes of Convolution Functions"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Exact Values of Bernstein n-Widths for Some Classes of Convolution Functions | Hindawi Publishing Corporation Journal of Inequalities and Applications Volume 2008 Article ID 451815 11 pages doi 2008 451815 Research Article Exact Values of Bernstein n-Widths for Some Classes of Convolution Functions Feng Guo1 2 1 School of Mathematical Sciences Beijing Normal University Beijing 100875 China 2 Department of Mathematics Taizhou University Taizhou Zhejiang 317000 China Correspondence should be addressed to Feng Guo gfeng@ Received 10 December 2007 Revised 7 April 2008 Accepted 16 June 2008 Recommended by Vijay Gupta We consider some classes of 2n-periodic convolution functions Bp and Kp which include the classical Sobolev class as a special case. With the help of the spectra of nonlinear integral equations we determine the exact values of Bernstein n-width of the classes Bp Kp in the space Lp for 1 p TO. Copyright 2008 Feng Guo. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction and main results Let X be a normed linear space and let A be a subset of X. Assume that A is closed convex and centrally symmetric . x G A implies -x G A . The Bernstein n-width which was originally introduced by Tikhomirov 1 of A in X is given by bn A X sup sup I XS X 1 c A Xn 1 where S Xn 1 x x G Xn 1 xH 1 and Xn 1 is taken over all subspaces of X of dimension at least n 1. Let T 0 2n be the torus and as usual let Lq Lq 0 2n be the classical Lebesgue integral space of 2n-periodic real-valued functions with the usual norm Hq 1 q TO. Denote by wp the classical Sobolev class of real functions f whose r - 1 th derivative is absolutely continuous and whose rth derivative satisfies the condition f w llq 1. The concept of Bernstein n-width for the Sobolev classes wp was originally introduced by Tikhomirov 1 . He considered bn wp Lqr 1 p q TO and found the exact value of b2n-1 WTO

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