Conferences - Seminars

  14:00-15:00 MA A1 12

The question whether every separable, nuclear C*-algebra satisfies Rosenberg-Schochet's universal coefficient theorem (UCT) is a major open problem in C*-algebra theory. Currently, renewed interest in this so-called UCT problem arises from the recent breakthrough results in the classification program for separable, simple, nuclear C*-algebras, where the UCT plays a rather mysterious role. In this talk, ... Read more about "Cartan subalgebras and the UCT problem"
By Selçuk Barlak
By Prof. Jonas Peters, University of Copenhagen
  14:00-15:00 MA A1 12

I will report on joint works with Julien Bichon, Sven Raum, Matthias Valvekens and Stefaan Vaes, revolving around the computation of L^2-Betti numbers for universal quantum groups. Among our main results is the fact that the first L^2-Betti number of the duals of the free unitary quantum groups equals 1, and that all other L^2-Betti ... Read more about "L^2-Betti numbers of universal quantum groups"
By David Kyed