Exactness of reduced amalgamated free product C*-algebras

Abstract

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.

arXiv comment21 pages

Cited by in corpus (1)

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