Seminar series
Date
Wed, 30 Jan 2013
Time
16:00 -
17:00
Location
SR2
Speaker
David Hume; Robert Kropholler; Martin Palmer and Alessandro Sisto
Organisation
University of Oxford
We will discuss (very) recent work by Hensel; Przytycki and Webb, who describe unicorn paths in the arc graph and show that they form 1-slim triangles and are invariant under taking subpaths. We deduce that all arc graphs are 7-hyperbolic. Considering the same paths in the arc and curve graph, this also shows that all curve graphs are 17-hyperbolic, including closed surfaces.