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math.OA2009
Extensions of the reduced group C*-algebra of a free product of amenable groups
Jonas Andersen Seebach, Klaus Thomsen
We prove that the unitary equivalence classes of extensions of C*_r(G) by any sigma-unital stable C"-algebra, taken modulo extensions which split via an asymptotic homomorphism, fo…
math.OA2009
Semi etale groupoids and applications
Klaus Thomsen
We introduce a class of locally compact Hausdorff groupoids and show how to associate C*-algebras to them in a way which generalizes the reduced C*-algebra of an 'etale groupoid. F…