Transformation Groups Seminar

Speaker: Tao Gong (Western)

"On contractibility of quotients of real toric varieties from Weyl groups II"

Time: 09:30

Room: MC 108

Given a reduced crystallographic root system with a fixed simple system, it is associated to a Weyl group $W$ and a polytope $P$ which is the convex hull of the $W$-orbit of a dominant weight. The polytope $P$ is associated to a real toric varieties $X_P^{\mathbb{R}}$. We will see that the underlying topological space $X_P^{\mathbb{R}}/W$ is contractible when the rank is below 7.

This is the second part of this talk.

Geometry and Topology

Speaker: Georg Wille (Philipps-Universität Marburg)

"Classifying spaces in discrete homotopy theory"

Time: 15:30

Room: MC 107