Seminar series
Date
Tue, 06 Feb 2024
Time
16:00 -
17:00
Location
C2
Speaker
Samantha Pilgrim
Organisation
University of Glasgow
I will give an introduction to quasidiagonality of group actions wherein an action on a C^*-algebra is approximated by actions on matrix algebras. This has implications for crossed product C^*-algebras, especially as pertains to finite dimensional approximation. I'll sketch the proof that all isometric actions are quasidiagonal, which we can view as a dynamical Petr-Weyl theorem. Then I will discuss an interplay between quasidiagonal actions and semiprojectivity of C^*-algebras, a property that allows "almost representations" to be perturbed to honest ones.