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COMMON FIXED POINTS FOR SEMIGROUPS OF POINTWISE LIPSCHITZIAN MAPPINGS IN BANACH SPACES

Published online by Cambridge University Press:  26 September 2011

W. M. KOZLOWSKI*
Affiliation:
School of Mathematics and Statistics, University of New South Wales, Sydney, NSW 2052, Australia (email: [email protected])
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Abstract

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Let C be a bounded, closed, convex subset of a uniformly convex Banach space X. We investigate the existence of common fixed points for pointwise Lipschitzian semigroups of nonlinear mappings Tt:CC, where each Tt is pointwise Lipschitzian. The latter means that there exists a family of functions αt:C→[0,) such that for x,yC. We also demonstrate how the asymptotic aspect of the pointwise Lipschitzian semigroups can be expressed in terms of the respective Fréchet derivatives.

Type
Research Article
Copyright
Copyright © Australian Mathematical Publishing Association Inc. 2011

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