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Non-expanding maps and Busemann functions

Published online by Cambridge University Press:  02 October 2001

ANDERS KARLSSON
Affiliation:
Department of Mathematics, ETH-Zentrum, CH-8092 Zürich, Switzerland (e-mail: karlsson@math.ethz.ch)
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Abstract

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We give stronger versions and alternative simple proofs of some results of Beardon, [Be1] and [Be2]. These results concern contractions of locally compact metric spaces and generalize the theorems of Wolff and Denjoy about the iteration of a holomorphic map of the unit disk. In the case of unbounded orbits, there are two types of statements which can sometimes be proven; first, about invariant horoballs, and second, about the convergence of the iterates to a point on the boundary. A few further remarks of similar type are made concerning certain random products of semicontractions and also concerning semicontractions of Gromov hyperbolic spaces.

Information

Type
Research Article
Copyright
2001 Cambridge University Press