tailieunhanh - Báo cáo hóa học: " Research Article An Extragradient Approximation Method for Equilibrium Problems and Fixed Point Problems of a Countable Family of Nonexpansive Mappings"

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 An Extragradient Approximation Method for Equilibrium Problems and Fixed Point Problems of a Countable Family of Nonexpansive Mappings | Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2008 Article ID 134148 17 pages doi 2008 134148 Research Article An Extragradient Approximation Method for Equilibrium Problems and Fixed Point Problems of a Countable Family of Nonexpansive Mappings Rabian Wangkeeree Department of Mathematics Faculty of Science Naresuan University Phitsanulok 65000 Thailand Correspondence should be addressed to Rabian Wangkeeree rabianw@ Received 28 February 2008 Accepted 13 July 2008 Recommended by Huang Nanjing We introduce a new iterative scheme for finding the common element of the set of common fixed points of nonexpansive mappings the set of solutions of an equilibrium problem and the set of solutions of the variational inequality. We show that the sequence converges strongly to a common element of the above three sets under some parameters controlling conditions. Moreover we apply our result to the problem of finding a common fixed point of a countable family of nonexpansive mappings and the problem of finding a zero of a monotone operator. This main theorem extends a recent result of Yao et al. 2007 and many others. Copyright 2008 Rabian Wangkeeree. 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 Let H be a real Hilbert space with inner product and norm ll H and let C be a closed convex subset of H. Let F be a bifunction of C X C into R where R is the set of real numbers. The equilibrium problem for ộ C X C R is to find x C such that ộ x y 0 Vy e C. The set of solutions of is denoted by EP ộ . Given a mapping T C H let ộ x ỳ Tx y - x for all x y e C. Then z e EP ộ if and only if Tz y - z 0 for all y e C that is z is a solution of the variational inequality. Numerous problems in physics optimization and economics reduce to find a solution of . In .

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