The fixed-point algebra of tensor-product actions of finite Abelian groups on UHF-algebras |
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Authors: | Niels Juul Munch |
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Affiliation: | Department of Mathematics, The University of Trondheim, 7034 Trondheim, NTH, Norway |
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Abstract: | Let G be a finite Abelian group acting by tensor-product automorphisms on a UHF-C1-algebra . Extending a result of A. Kishimoto it is shown that the number of extremal traces on the fixed-point algebra G equals the cardinality of the subgroup K of automorphisms in G which are weakly inner in the trace representation of . |
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