TAILIEUCHUNG - Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2011, Article ID 847170,

Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2011, Article ID 847170, 19 pages doi: Research Article Common Fixed Point Theorems for a Finite Family of Discontinuous and Noncommutative Maps Lai-Jiu Lin and Sung-Yu Wang Department of Mathematics, National Changhua University of Education, Changhua 50058, Taiwan Correspondence should be addressed to Lai-Jiu Lin, maljlin@ Received 30 December 2010; Accepted 20 February 2011 Academic Editor: Jong Kim Copyright q 2011 . Lin and . Wang. 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. | Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2011 Article ID 847170 19 pages doi 2011 847170 Research Article Common Fixed Point Theorems for a Finite Family of Discontinuous and Noncommutative Maps Lai-Jiu Lin and Sung-Yu Wang Department of Mathematics National Changhua University of Education Changhua 50058 Taiwan Correspondence should be addressed to Lai-Jiu Lin maljlin@ Received 30 December 2010 Accepted 20 February 2011 Academic Editor Jong Kim Copyright 2011 . Lin and . Wang. 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. We study common fixed point theorems for a finite family of discontinuous and noncommutative single-valued functions defined in complete metric spaces. We also study a common fixed point theorem for two multivalued self-mappings and a stationary point theorem in complete metric spaces. Throughout this paper we establish common fixed point theorems without commuting and continuity assumptions. In contrast commuting or continuity assumptions are often assumed in common fixed point theorems. We also give examples to show our results. Results in this paper except those that generalized Banach contraction principle and those improve and generalize recent results in fixed point theorem are original and different from any existence result in the literature. The results in this paper will have some applications in nonlinear analysis and fixed point theory. 1. Introduction and Preliminaries Let X d be a metric space and T X X be a multivalued map. We say that x e X is a stationary point of T if T x x . The existence theorem of stationary point was first considered by Dancs et al. 1 . If S is a self-mapping multivalued or single valued defined on X we denote F S the collection of all the fixed points of S. In this paper we need the

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