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Marcel Bökstedt
(Institut for Matematik, AU)
Onsdag, 1 oktober, 2014, at 16:15-17:15, in Aud. D3 (1531-215)
Consider a configuration space of sets of unordered sets of colored points moving on a surface. For each pair of colors we specify if points of these colors are allowed to coincide or not.  

The space will depend on the number of points of each given color. We assume that there are at least two points of each color. The fundamental group of these spaces turn out to be metabelian groups. We give a computation of these fundamental groups. This computation will involve defining a linking number in our situation, and also a detour into a cohomology theory of graphs.

Organiseret af: QGM