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The cohomology and $K$-theory of commuting homeomorphisms of the Cantor set

Published online by Cambridge University Press:  01 June 1999

ALAN FORREST
Affiliation:
Department of Mathematics and Statistics, NTNU, 7034-Trondheim, Norway (e-mail: alanf@matstat.unit.no)
JOHN HUNTON
Affiliation:
Department of Mathematics and Computer Science, University of Leicester, University Road, Leicester, LE1 7RH, UK (e-mail: jrh7@leicester.ac.uk)

Abstract

Given a $\mathbb{Z}^d$ homeomorphic action, $\alpha$, on the Cantor set, $X$, we consider the higher order continuous integer valued dynamical cohomology, $H^*(X,\alpha)$. We also consider the dynamical $K$-theory of the action, the $K$-theory of the crossed product $C^*$-algebra $C(X)\times_{\alpha}\mathbb{Z}^d$. We show that these two invariants are essentially equivalent. We also show that they only take torsion free values. Our work links the two invariants via a third invariant which is based on topological complex $K$-theory evaluated on an associated mapping torus.

Type
Research Article
Copyright
1999 Cambridge University Press

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