Extensions of Groups and Simple C*-Algebras
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Since Powers () proved that the reduced C*-algebra of the free group on two generators C r * (F2) is simple with unique trace, several other classes consisting of discrete groups G such that C r * (G) is simple with unique trace have been produced (see e.g. , ).
KeywordsNormal Subgroup Conjugacy Class Operator Algebra Discrete Group Combinatorial Property
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