tailieunhanh - Báo cáo hóa học: " Research Article Composite Implicit General Iterative Process for a Nonexpansive Semigroup in Hilbert Space"

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 Composite Implicit General Iterative Process for a Nonexpansive Semigroup in Hilbert Space | Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2008 Article ID 484050 13 pages doi 2008 484050 Research Article Composite Implicit General Iterative Process for a Nonexpansive Semigroup in Hilbert Space Lihua Li 1 Suhong Li 1 and Yongfu Su2 1 Department of Mathematic and Physics Hebei Normal University of Science and Technology Qinhuangdao Hebei 066004 China 2 Department of Mathematics Tianjin Polytechnic University Tianjin 300160 China Correspondence should be addressed to Lihua Li lilihua103@ Received 19 March 2008 Accepted 14 August 2008 Recommended by Helene Frankowska Let C be nonempty closed convex subset of real Hilbert space H. Consider C a nonexpansive semigroup I T s s 0 with a common fixed point a contraction f with coefficient 0 a 1 and a strongly positive linear bounded operator A with coefficient Y 0. Let 0 Y Y a. It is proved that the sequence xn generated iteratively by xn I - anA 1 tn f 0fT s ynds anYf xn yn I - pnA xn fnpf xn converges strongly to a common fixed point x e F I which solves the variational inequality yf - A x z - xf 0 for all z e F I . Copyright 2008 Lihua Li et al. 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 preliminaries Let C be a closed convex subset of a Hilbert space H recall that T C C is nonexpansive if Tx - Ty x - y for all x y e C. Denote by F T the set of fixed points of T that is F T x e C Tx x . Recall that a family I T s 0 s to of mappings from C into itself is called a nonexpansive semigroup on C if it satisfies the following conditions i T 0 x x for all x e C ii T s f T s T f for all s f 0 iii T s x - T s yll x - y for all x y e C and s 0 iv for all x e C s T s x is continuous. We denote by F I the set of all common fixed points of I that is F I J- T s . It is known that F I is closed and .

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