Dynamical Systems Seminar

Title: Quasi-morphisms continuous for the C^0-topology on groups of area-preserving diffeomorphisms of surfaces
Speaker: Professor Pierre Py
Speaker Info: University of Chicago
Brief Description:
Special Note:

I will recall the notion of a quasi-morphism on a group and describe a few examples of quasi-morphisms defined on groups of Hamiltonian diffeomorphisms of surfaces. Then we will try to answer the following question: which quasi-morphisms on these groups are continuous for the C0-topology? This question is related to the problem of the simplicity of the group of compactly supported area-preserving homeomorphisms of the disc. This is based on a joint work with M. Entov and L. Polterovich. This is also related to a recent work of Le Roux.
Date: Tuesday, November 25, 2008
Time: 3:00pm
Where: Lunt 105
Contact Person: Prof. Pat Hooper
Contact email: wphooper@math.northwestern.edu
Contact Phone: 847-491-2853
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