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Extensions of the reduced group C*-algebra of a free product of amenable groups

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We prove that the unitary equivalence classes of extensions of View the MathML source by any σ-unital stable C*-algebra, taken modulo extensions which split via an asymptotic homomorphism, form a group which can be calculated from the universal coefficient theorem of KK-theory when G is a free product of a countable collection of countable amenable groups.
Original languageEnglish
JournalAdvances in Mathematics
Pages (from-to)1845-1954
Number of pages10
Publication statusPublished - 2010

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