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CONTRACTIVE FAMILIES ON COMPACT SPACES

Part of: Spaces with richer structures Nonlinear operators and their properties

Published online by Cambridge University Press:  14 May 2014

Luka Milićević
Luka Milićević*
Affiliation:
Trinity College, Cambridge CB2 1TQ,U.K. email lm497@cam.ac.uk
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Abstract

A family $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}f_1,\ldots,f_n$ of operators on a complete metric space $X$ is called contractive if there exists $\lambda < 1$ such that for any $x,y$ in $X$ we have $d(f_i(x),f_i(y)) \leq \lambda d(x,y)$ for some $i$. Stein conjectured that for any contractive family there is some composition of the operators $f_i$ that has a fixed point. Austin gave a counterexample to this, and asked whether Stein’s conjecture is true if we restrict to compact spaces. Our aim in this paper is to show that, even for compact spaces, Stein’s conjecture is false.

MSC classification

Secondary: 47H09: Contraction-type mappings, nonexpansive mappings, $A$-proper mappings, etc. 54E45: Compact (locally compact) metric spaces
Type
Research Article
Information
Mathematika , Volume 60 , Issue 2 , July 2014 , pp. 444 - 462
Copyright
Copyright © University College London 2014 

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References

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