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Topological entropy of some automorphisms of reduced amalgamated free product C^*-algebras
Published online by Cambridge University Press: 28 November 2001
Abstract
Certain classes of automorphisms of reduced amalgamated free products of C^*-algebras are shown to have Brown–Voiculescu topological entropy zero. Also, for automorphisms of exact C^*-algebras, the Connes–Narnhofer–Thirring entropy is shown to be bounded above by the Brown–Voiculescu entropy. These facts are applied to generalize Størmer's result about the entropy of automorphisms of the {\rm II}_1-factor of a free group.
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- 2001 Cambridge University Press
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