Remarks on pseudo-contractive mappings
Author:
W. A. Kirk
Journal:
Proc. Amer. Math. Soc. 25 (1970), 820-823
MSC:
Primary 47.85; Secondary 46.00
DOI:
https://doi.org/10.1090/S0002-9939-1970-0264481-X
MathSciNet review:
0264481
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Abstract | References | Similar Articles | Additional Information
Abstract: Let $X$ be a Banach space, $D \subset X$. A mapping $U:D \to X$ is said to be pseudo-contractive if for all $u,v \in D$ and all $r > 0$, $||u - v|| \leqq ||(1 + r)(u - v) - r(U(u) - U(v))||$. This concept is due to F. E. Browder, who showed that $U:X \to X$ is pseudo-contractive if and only if $I - U$ is accretive. In this paper it is shown that if $X$ is a uniformly convex Banach, $B$ a closed ball in $X$, and $U$ a Lipschitzian pseudo-contractive mapping of $B$ into $X$ which maps the boundary of $B$ into $B$, then $U$ has a fixed point in $B$. This result is closely related to a recent theorem of Browder.
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- M. S. Brodskiĭ and D. P. Mil′man, On the center of a convex set, Doklady Akad. Nauk SSSR (N.S.) 59 (1948), 837–840 (Russian). MR 0024073
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Additional Information
Keywords:
Fixed point theory,
uniformly convex Banach spaces,
pseudo-contractive mappings,
nonexpansive mappings,
accretive mappings
Article copyright:
© Copyright 1970
American Mathematical Society