Stable elements and property (S)

Abstract

We study the relation (and differences) between stability and Property (S) in the simple and stably finite framework. This leads us to characterize stable elements in terms of their support, and study these concepts from different sides: hereditary subalgebras, projections in the multiplier algebra and order properties in the Cuntz semigroup. We use these approaches to show both that cancellation at infinity on the Cuntz semigroup just holds when its Cuntz equivalence is given by isomorphism at the level of Hilbert right-modules, and that different notions such as Regularity, ω-comparison, Corona Factorization Property, property R, etc. are equivalent under mild assumptions.