AG Lie-Gruppen: Kang Li

Vortragender: Kang Li, FAU Erlangen
Veranstalter: Karl-Hermann Neeb

Titel: Ghost projections and expanderish graphs

Abstract:

Roughly speaking, a ghost operator is often an infinite matrix such that its
matrix entries vanish at the infinity. This notion was introduced by Guoliang
Yu
in the study of the so-called coarse Baum-Connes conjecture. It is a very
central topic in coarse geometry and operator algebras with applications to
provide counterexamples to the coarse Baum-Connes conjecture, the existence of
non-exact groups and the rigidity problem for Roe-type algebras. In this talk,
we will visualize a class of ghost projections in terms of expanderish graphs.