English

Inductive Limits of Noncommutative Cartan Inclusions

Operator Algebras 2024-10-29 v3

Abstract

We prove that an inductive limit of aperiodic noncommutative Cartan inclusions is a noncommutative Cartan inclusion whenever the connecting maps are injective, preserve normalisers and entwine conditional expectations. We show that under the additional assumption that the inductive limit Cartan subalgebra is either essentially separable, essentially simple or essentially of Type I we get an aperiodic inclusion in the limit. Consequently, we subsume the case where the building block Cartan subalgebras are commutative and provide a proof of a theorem of Xin Li without passing to twisted \'etale groupoids.

Keywords

Cite

@article{arxiv.2205.14053,
  title  = {Inductive Limits of Noncommutative Cartan Inclusions},
  author = {Ralf Meyer and Ali Imad Raad and Jonathan Taylor},
  journal= {arXiv preprint arXiv:2205.14053},
  year   = {2024}
}

Comments

Final version, some minor changes. To appear in Proc. Amer. Math. Soc