Vortrag von Alexander Rahm (Galway, Irland)
Discrete groups and torsion subcomplexes I
What 


When 
Apr 15, 2013 from 10:15 AM to 11:45 AM 
Where  Raum 218, Eckerstr. 1 
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Alexander Rahm will give a series of four talks on discrete groups and
torsion subcomplexes. Torsion subcomplexes are a method to understand
the torsion in the homology of groups. In the case of Bianchi groups,
i.e. PSL_2 over imaginary number rings, one can establish a close
connection between the geometry of the group acting on hyperbolic
3space and the arithmetic of the underlying number ring. The lecture
series will explain the background and applications of torsion
subcomplexes.
 Bianchi groups and hyperbolic space
 Homology of arithmetic groups
 Coxeter groups and equivariant Khomology
 ChenRuan orbifold cohomology in mathematical physics
Room and time tba.