Exactness of reduced amalgamated free product C*-algebras

Details Exactness of reduced amalgamated free product C*-algebras Exactness of reduced amalgamated free product C*-algebras

1999-11-02

arxiv.org/abs/math/9911001v1

Mathematics

Operator Algebras

21 pages

Scientific paper

Some completely positive maps on reduced amalgamated free products of
C*-algebras are constructed; these allow a proof that the class of exact unital
C*-algebras is closed under taking reduced amalgamated free products.
Consequently, the class of exact discrete groups is closed under taking
amalgamated free products.

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