Reflections in non-negative curvature 

Karsten Grove (Notre Dame, USA)

Abstract: Understanding polar actions in nonnegative curvature 
(joint work with Fang and Thorbergsson) requires an understanding 
of reflection groups on such manifolds. 

I will describe the general structure of nonnegatively curved manifolds 
with reflection groups including a somewhat surprising classification
in certain natural cases, where the group is large.