Seminars and Colloquia by Series

Monday, November 6, 2017 - 13:55 , Location: TBA , TBA , TBA , Organizer: Caitlin Leverson
Monday, October 23, 2017 - 13:55 , Location: Skiles 006 , Mark Hughes , BYU , Organizer: John Etnyre
Monday, October 16, 2017 - 13:55 , Location: Skiles 006 , Kyle Hayden , Boston College , Organizer: John Etnyre
Monday, October 2, 2017 - 13:55 , Location: Skiles 006 , TBA , TBA , Organizer: Caitlin Leverson
Monday, September 25, 2017 - 15:00 , Location: Skiles 005 , Hung Tran , Georgia , Organizer: Dan Margalit
Monday, September 18, 2017 - 13:50 , Location: Skiles 006 , Michael Landry , Yale , , Organizer: Balazs Strenner
Monday, September 11, 2017 - 13:55 , Location: Skiles 006 , TBA , TBA , Organizer: Caitlin Leverson
Monday, September 4, 2017 - 14:15 , Location: Skiles 006 , None , None , Organizer: Dan Margalit
Tuesday, August 22, 2017 - 11:00 , Location: Skiles 006 , Juliette Bavard , University of Chicago , Organizer: Balazs Strenner
The mapping class group of the plane minus a Cantor set naturally appears in many dynamical contexts, including group actions on surfaces, the study of groups of homeomorphisms on a Cantor set, and complex dynamics. In this talk, I will present the 'ray graph', which is a Gromov-hyperbolic graph on which this big mapping class group acts by isometries (it is an equivalent of the curve graph for this surface of infinite topological type). If time allows, I will give a description of the Gromov-boundary of the ray graph in terms of long rays in the plane minus a Cantor set. This involves joint work with Alden Walker.
Monday, August 14, 2017 - 14:11 , Location: Skiles 006 , Albert Fathi , Georgia Tech , Organizer: Dan Margalit
We will give different topological very simple statements that seem not to have been noticed, although they are of the level of Brouwer’s fixed point theorem. The main result is: Let F be a compact subset of the manifold M. Assume g:F->M is a continuous map which is the identity on the boundary (or frontier) of F, then the image g(F) contains either F or M\F.