Seminar series
Date
Tue, 10 Feb 2026
16:00
16:00
Location
C3
Speaker
Alexander Ravnanger
Organisation
Dept of Mathematical Sciences University of Copenhagen
In this talk from Alexander Ravnanger, he provides a dynamical description of the largest AF-ideal in certain crossed products by the integers. In the case of the uniform Roe algebra of the integers, this reveals an interesting connection to a well-studied object in topological semigroup theory. On the way, he gives an overview of what is known about the abundance of projections in such crossed products, the structure of the simple quotients, and concepts of low-dimensionality for uniform Roe algebras.