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Remarks on Pseudo-Contractive Mappings

1970
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Proceedings of the American Mathematical Society
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Let X be a Banach space, D QX. A mapping U:D-^>X is said to be pseudo-contractive if for all u,v(ED and all r>0, (I** -»H = ll(.i+r)(tt-v)-r(U(u) -U(v))\\. This concept is due to F. E. Browder, who showed that U:X-+X is pseudo-contractive if and only if I -Uis 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

doi:10.2307/2036758
fatcat:eocz5nugevb7ph7d356e7w26h4