Partial crossed product description of the C*-algebras associated with integral domains

Details Partial crossed product description of the C*-algebras associated with integral domains Partial crossed product description of the C*-algebras associated with integral domains

2010-10-05

arxiv.org/abs/1010.0967v2

Mathematics

Operator Algebras

11 pages

Scientific paper

Recently, Cuntz and Li introduced the C^*-algebra A[R] associated to an integral domain R with finite quotients. In this paper, we show that A[R] is a partial group algebra of the group $K \rtimes K^x$ with suitable relations, where K is the field of fractions of R. We identify the spectrum of this relations and we show that it is homeomorphic to the profinite completion of R. By using partial crossed product theory, we reconstruct some results proved by Cuntz and Li. Among them, we prove that $\ar$ is simple by showing that the action is topologically free and minimal.

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