Fixed Point and Non-Linear Ergodic Theorems for Semigroups of Non-Linear Mappings

Anthony To-Ming Lau () and Wataru Takahashi ()
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Anthony To-Ming Lau: University of Alberta, Department of Mathematical Sciences
Wataru Takahashi: Tokyo Institute of Technology, Department of Mathematical and Computing Sciences

Chapter Chapter 15 in Handbook of Metric Fixed Point Theory, 2001, pp 517-555 from Springer

Abstract: Abstract Let S be a semigroup, ℓ∞(S) be the Banach space of bounded real valued functions on S with the supremum norm. There is a strong relation between the existence of an invariant mean (or submean) on an invariant subspace of ℓ∞(S) and fixed point or ergodic properties of S when S is represented as a semigroup of nonexpansive mappings on a closed convex subset of a Banach space. It is the purpose of this chapter of the Handbook to exhibit on some recent results on such relations. Since this handbook is intended for researchers and graduate students, detailed proofs for central results, historical remarks, open problems and many references will be included. It is our hope that our effort will generate further research in this direction of non-linear analysis which depends on the ideal theory of S,and existence of an invariant mean (or submean) on a subspace of ℓ∞(S) of a semigroup S.

Keywords: Banach Space; Convex Subset; Fixed Point Theorem; Nonexpansive Mapping; Nonempty Closed Convex Subset (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1007/978-94-017-1748-9_15

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