tailieunhanh - Báo cáo hóa học: " FIXED POINTS OF MULTIMAPS WHICH ARE NOT NECESSARILY NONEXPANSIVE"

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: FIXED POINTS OF MULTIMAPS WHICH ARE NOT NECESSARILY NONEXPANSIVE | FIXED POINTS OF MULTIMAPS WHICH ARE NOT NECESSARILY NONEXPANSIVE NASEER SHAHZAD AND AMJAD LONE Received 16 October 2004 and in revised form 3 December 2004 Let C be a nonempty closed bounded convex subset of a Banach space X whose characteristic of noncompact convexity is less than 1 and T a continuous 1-x-contractive SL map which is not necessarily nonexpansive from C to KC X satisfying an inwardness condition where KC X is the family of all nonempty compact convex subsets of X. It is proved that T has a fixed point. Some fixed points results for noncontinuous maps are also derived as applications. Our result contains as a special case a recent result of Benavides and Ramirez 2004 . 1. Introduction During the last four decades various fixed point results for nonexpansive single-valued maps have been extended to multimaps see for instance the works of Benavides and Ramirez 2 Kirk and Massa 6 Lami Dozo 7 Lim 8 Markin 10 Xu 12 and the references therein. Recently Benavides and Ramirez 3 obtained a fixed point theorem for nonexpansive multimaps in a Banach space whose characteristic of noncompact convexity is less than 1. More precisely they proved the following theorem. Theorem see 3 . Let C be a nonempty closed bounded convex subset of a Banach space X such that ea X 1 and T C - KC X a nonexpansive 1- -contractive map. If T satisfies T x c IC x Vx G C then T has a fixed point. Benavides and Ramirez further remarked that the assumption of nonexpansiveness in the above theorem can not be avoided. In this paper we prove a fixed point result for multimaps which are not necessarily nonexpansive. To establish this we define a new class of multimaps which includes nonexpansive maps. To show the generality of our result we present an example. As consequences of our main result we also derive some fixed point theorems for -nonexpansive maps. Copyright 2005 Hindawi Publishing Corporation Fixed Point Theory and Applications 2005 2 2005 169-176 DOI

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