TAILIEUCHUNG - Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2011, Article ID 780764,

Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2011, Article ID 780764, 15 pages doi: Research Article An Iteration Method for Common Solution of a System of Equilibrium Problems in Hilbert Spaces Jong Kyu Kim1 and Nguyen Buong2 1 Department of Mathematics Education, Kyungnam University, Masan Kyunganm 631-701, Republic of Korea 2 Department of Mathematics, Vietnamse Academy of Science and Technology, Institute of Information Technology, 18, Hoang Quoc Viet, q. Cau Giay, Hanoi 122100, Vietnam Correspondence should be addressed to Jong Kyu Kim, jongkyuk@ Received 11 December 2010; Revised 3 March 2011; Accepted 4 March 2011 Academic Editor: Qamrul Hasan Ansari Copyright q. | Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2011 Article ID 780764 15 pages doi 2011 780764 Research Article An Iteration Method for Common Solution of a System of Equilibrium Problems in Hilbert Spaces Jong Kyu Kim1 and Nguyen Buong2 1 Department of Mathematics Education Kyungnam University Masan Kyunganm 631-701 Republic of Korea 2 Department of Mathematics Vietnamse Academy of Science and Technology Institute of Information Technology 18 Hoang Quoc Viet q. Cau Giay Hanoi 122100 Vietnam Correspondence should be addressed to Jong Kyu Kim jongkyuk@ Received 11 December 2010 Revised 3 March 2011 Accepted 4 March 2011 Academic Editor Qamrul Hasan Ansari Copyright 2011 J. K. Kim and N. Buong. 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. The strong convergence theorem is proved for finding a common solution for a system of equilibrium problems find u e S nN1EP Fi EP Fi z e C Fi z v 0 Vv e C i 1 . . N where C is a closed convex subset of a Hilbert space H and Fi are N bifunctions from C X C into R given exactly or approximatively. As an application finding a common solution for a system of variational inequality problems is given. 1. Introduction Let H be a real Hilbert space with the scalar product and the norm denoted by the symbols and II II respectively. Let C be a nonempty closed convex subset of H and let Ffi 1 . N be N bifunctions from C X C into R. In this paper we consider the system of equilibrium problems find u e S nNiEP Fi _ _ EP Fi z e C Fi z v 0 Vv e C i 1 . N. We assume that S Ỷ 0 and the bifunctions Fi satisfy the following conditions. Condition 1. The bifunction F satisfies the following conditions A1 F u u 0 for all u e C. A2 F fu v F v Ù 0 for all u v e C X C. 2 Fixed Point Theory and Applications A3 For every u e C F u C R is lower

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