English

An asymptotic homotopy lifting property

Operator Algebras 2024-03-27 v2

Abstract

A CC^*-algebra AA is said to have the homotopy lifting property if for all CC^*-algebras BB and EE, for every surjective ^*-homomorphism π ⁣:EB\pi \colon E \rightarrow B and for every ^*-homomorphism ϕ ⁣:AE\phi \colon A \rightarrow E, any path of ^*-homomorphisms ABA \rightarrow B starting at πϕ\pi \phi lifts to a path of ^*-homomorphisms AEA \rightarrow E starting at ϕ\phi. Blackadar has shown that this property holds for all semiprojective CC^*-algebras. We show that a version of the homotopy lifting property for asymptotic morphisms holds for separable CC^*-algebras that are sequential inductive limits of semiprojective CC^*-algebras. It also holds for any separable CC^*-algebra if the quotient map π\pi satisfies an approximate decomposition property in the spirit of (but weaker than) the notion of quasidiagonality for extensions.

Keywords

Cite

@article{arxiv.2311.06677,
  title  = {An asymptotic homotopy lifting property},
  author = {José R. Carrión and Christopher Schafhauser},
  journal= {arXiv preprint arXiv:2311.06677},
  year   = {2024}
}

Comments

Minor typographical errors corrected. Accepted for publication in M\"unster J. Math