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It is shown that, for any field
, any ordered vector space structure of
with Riesz interpolation is given by an inductive limit of a sequence with finite stages
does not change). This relates to a conjecture of Effros and Shen, since disproven, which is given by the same statement, except with
replaced by the integers,
. Indeed, it shows that although Effros and Shen’s conjecture is false, it is true after tensoring with
We examine the ranks of operators in semi-finite
-algebras as measured by their densely defined lower semicontinuous traces. We first prove that a unital simple
-algebra whose extreme tracial boundary is nonempty and finite contains positive operators of every possible rank, independent of the property of strict comparison. We then turn to nonunital simple algebras and establish criteria that imply that the Cuntz semigroup is recovered functorially from the Murray–von Neumann semigroup and the space of densely defined lower semicontinuous traces. Finally, we prove that these criteria are satisfied by not-necessarily-unital approximately subhomogeneous algebras of slow dimension growth. Combined with results of the first author, this shows that slow dimension growth coincides with
-stability for approximately subhomogeneous algebras.
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