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math.OA2005★ 2 cited
On simplicity of reduced C*-algebras of groups
Pierre de la Harpe
A countable group is C*-simple if its reduced C*-algebra is a simple algebra. Since Powers recognised in 1975 that non-abelian free groups are C*-simple, large classes of groups wh…
math.OA2003
Mapping class groups and outer automorphism groups of free groups are C*-simple
Martin R. Bridson, Pierre de la Harpe
We prove that the reduced C*-algebras of centerless mapping class groups and outer automorphism groups of free groups are simple, as are the irreducible pure subgroups of mapping c…