Completely positive maps of order zero

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dc.creatorWinter, Wilhelm
dc.creatorZacharias, Joachim
dc.date2009-03-19
dc.date.accessioned2026-07-07T12:54:14Z
dc.date.available2026-07-07T12:54:14Z
dc.descriptionWe say a completely positive contractive map between two C*-algebras has order zero, if it sends orthogonal elements to orthogonal elements. We prove a structure theorem for such maps. As a consequence, order zero maps are in one-to-one correspondence with *-homomorphisms from the cone over the domain into the target algebra. Moreover, we conclude that tensor products of order zero maps are again order zero, that the composition of an order zero map with a tracial functional is again a tracial functional, and that order zero maps respect the Cuntz relation, hence induce ordered semigroup morphisms between Cuntz semigroups.
dc.description13 pages
dc.identifierhttps://arxiv.org/abs/0903.3290
dc.identifierhttp://arxiv.org/abs/0903.3290
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/223858
dc.subjectOperator Algebras
dc.subjectFunctional Analysis
dc.subject46L05; 46L85
dc.titleCompletely positive maps of order zero
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