1-slim triangles and uniform hyperbolicity for arc graphs and curve graphs

Sebastian Hensel; Piotr Przytycki; Richard C.H. Webb

doi:10.4171/jems/517

JournalsjemsVol. 17, No. 4pp. 755–762

1-slim triangles and uniform hyperbolicity for arc graphs and curve graphs

Sebastian Hensel
University of Chicago, USA
Piotr Przytycki
McGill University, Montreal, Canada
- zbMATH Open
Richard C.H. Webb
University College London, UK
- MathSciNet
- zbMATH Open

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Abstract

We 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.

Cite this article

Sebastian Hensel, Piotr Przytycki, Richard C.H. Webb, 1-slim triangles and uniform hyperbolicity for arc graphs and curve graphs. J. Eur. Math. Soc. 17 (2015), no. 4, pp. 755–762

DOI 10.4171/JEMS/517