The Corona Factorization Property, Stability, and the Cuntz Semigroup of a C*-algebra

Eduardo Ortega Esparza, F. Perera, M. Rordam

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Abstrakt

The Corona Factorization Property, originally invented to study extensions of C*-algebras, conveys essential information about the intrinsic structure of the C*-algebra. We show that the Corona Factorization Property of a Sigma-unital C*-algebra is completely captured by its Cuntz semigroup (of equivalence classes of positive elements in the stabilization of A). The corresponding condition in the Cuntz semigroup is a very weak comparability property termed the Corona Factorization Property for semigroups. Using this result, one can, for example, show that all unital C*-algebras with a finite decomposition rank have the Corona Factorization Property. Applying similar techniques, we study the related question of when C*-algebras are stable. We give an intrinsic characterization, that we term property (S), of C*-algebras that have no nonzero unital quotients and no nonzero bounded 2-quasitraces. We then show that property (S) is equivalent to stability provided that the Cuntz semigroup of the C*-algebra has another (also very weak) comparability property, that we call the omega-comparison property.
OriginalsprogEngelsk
TidsskriftInternational Mathematics Research Notices
Udgave nummer1
Sider (fra-til)34-66
Antal sider33
ISSN1073-7928
DOI
StatusUdgivet - 2012

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