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a fixed point theorem for asymptotically ... - Semantic Scholar
Browder, D. Göhde, and W. A. Kirk. In 1965, F. E. Browder [1] and D. Göhde [4] independently proved that every nonexpansive self-mapping of a closed convex ...
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY Volume 35, No. 1. September 1972
A FIXED POINT THEOREM FOR ASYMPTOTICALLY NONEXPANSIVE MAPPINGS K. GOEBEL1 AND W. A. KIRK2
Abstract. Let K be a subset of a Banach space X. A mapping F.K-+KÍ& said to be asymptotically nonexpansive if there exists a sequence {k¡} of real numbers with £¿-+1 as /'-►co such that
WF'x—F'yW^kiWx—yW, x, yE K. It is proved that if ATis a nonempty, closed, convex, and bounded subset of a uniformly convex Banach space, and if F-.K-+K is asymptotically nonexpansive, then F has a fixed point. This result generalizes a fixed point theorem for nonexpansive mappings proved independently by F. E. Browder, D. Göhde, and W. A. Kirk.
In 1965, F. E. Browder [1] and D. Göhde [4] independently proved that every nonexpansive self-mapping of a closed convex and bounded subset of a uniformly convex Banach space has a fixed point. This result was also obtained by W. A. Kirk [5], under assumptions slightly weaker in a technical sense, and another proof, more geometric and elementary in nature, has recently been given by K. Goebel [3]. Our purpose here is to extend Browder's result to a more general class of transformations which we shall call "asymptotically nonexpansive" mappings. A Banach space X is called uniformly convex (Clarkson [2]) if for each £>0 there is a «5(e)>0 such that if ||x|| = ||_y||= l then ||(x+_y)/2||■(U, Xi, A2X2, ^3X3,
