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Proceedings of the American Mathematical Society

ISSN 1088-6826(online) ISSN 0002-9939(print)



Fixed points and iteration of a nonexpansive mapping in a Banach space

Author: Shiro Ishikawa
Journal: Proc. Amer. Math. Soc. 59 (1976), 65-71
MSC: Primary 47H10
MathSciNet review: 0412909
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Abstract: The following result is shown. If $T$ is a nonexpansive mapping from a closed convex subset $D$ of a Banach space into a compact subset of $D$ and ${x_1}$ is any point in $D$, then the sequence $\{ {x_n}\}$ defined by ${x_{n + 1}} = {2^{ - 1}}({x_n} + T{x_n})$ converges to a fixed point of $T$. As a matter of fact, a theorem which includes this result is proved. Furthermore, a similar result is obtained under certain restrictions which do not imply the assumption on the compactness of $T$.

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Keywords: Iteration method, nonexpansive mapping
Article copyright: © Copyright 1976 American Mathematical Society