Nearly unperforated Cuntz semigroups of Z-stable C*-algebras

Let AA be a Z\mathcal{Z}-stable CC^*-algebra, meaning that AAZA\cong A\otimes\mathcal{Z}. Let Cu(A)\operatorname{Cu}(A) be its Cuntz semigroup, and recall that a positively ordered semigroup is nearly unperforated when its near-unperforation comparison property holds. Nearly unperforated conjecture. The Cuntz semigroup Cu(A)\operatorname{Cu}(A) is nearly unperforated. This is motivated by the established almost-unperforation results for Z\mathcal{Z}-stable algebras and by partial results under additional hypotheses such as simplicity or real rank zero with stable rank one. The supplied text leaves the general assertion open.

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Primary source

Ramon Antoine, Francesc Perera and Hannes Thiel, “Tensor products and regularity properties of Cuntz semigroups”, arXiv:1410.0483 (2015).

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