8 maj 2008, kl 14.15-15.10, Tom Ward (University of East Anglia): Rigidity and entropy geometry

Abstract. Abelian measure rigidity (situations where measures invariant by several commuting maps are forced to be algebraic in nature) has found many applications. In the case of zero-dimensional algebraic systems, a very simple approach to proving measure rigidity may be given using the geometry of how the systems produce entropy. (Joint work with Manfred Einsiedler)