tailieunhanh - Báo cáo hóa học: " Research Article An Extragradient Method for Fixed Point Problems and Variational Inequality Problems"

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 Method for Fixed Point Problems and Variational Inequality Problems | Hindawi Publishing Corporation Journal ofInequalities and Applications Volume 2007 Article ID 38752 12 pages doi 2007 38752 Research Article An Extragradient Method for Fixed Point Problems and Variational Inequality Problems Yonghong Yao Yeong-Cheng Liou and Jen-Chih Yao Received 11 September 2006 Accepted 10 December 2006 Recommended by Yeol-Je Cho We present an extragradient method for fixed point problems and variational inequality problems. Using this method we can find the common element of the set of fixed points of a nonexpansive mapping and the set of solutions of the variational inequality for monotone mapping. Copyright 2007 Yonghong Yao 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 Let C be a closed convex subset of a real Hilbert space H. Recall that a mapping A of C into H is called monotone if Au - Av u - v 0 for all u v e C. A is called a-inverse strongly monotone if there exists a positive real number a such that Au - Av u - v aỊỊAu - AvII2 for all u v e C. It is well known that the variational inequality problem VI A C is to find u e C such that Au v - Ù 0 2 Journal of Inequalities and Applications for all v e C see 1-3 . The set of solutions of the variational inequality problem is denoted by Q. The variational inequality has been extensively studied in the literature see for example 4-6 and the references therein. A mapping S of C into itself is called nonexpansive if l Su - Sv ỊỊu - v for all u v e C. We denote by F S the set of fixed points of S. For finding an element of F S n Q under the assumption that a set C c H is closed and convex a mapping s of C into itself is nonexpansive and a mapping A of C into H is a-inverse strongly monotone Takahashi and Toyoda 7 introduced the following iterative scheme xn 1 anxn 1 an SpC xn nAxn 1 5 .

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