Geometry Seminar

Distance and intersection number in the curve complex

William W. Menasco, University at Buffalo-SUNY

Monday, October 29th, 2018
3:30 PM - 4:30 PM
Hylan 1106A

Let $S_g$ be a closed oriented surface of genus $g \geq 2 $ and $\mathcal{C}^1(S_g)$ be its curve complex—vertices are homotopy classes of essential simple closed curves with two vertices sharing an edge if they have disjoint representatives. It is known that $\mathcal{C}^1(S_g)$ is path connected, and the distance, $d(\alpha, \beta)$, between two vertices $\alpha, \beta \in \mathcal{C}^1(S)$ is just the minimal count of the number of edges in an edge-path between $\alpha$ and $\beta$. One can also consider, $ i(\alpha,\beta)$, the minimal intersection between curve representatives of $\alpha$ and $\beta$. This talk will discuss how $i(\alpha,\beta)$ grows as $d(α,β) grows. This is joint work with Joan Birman and Dan Margalit and features work with Matthew Morse.

Event contact: sema dot salur at rochester dot edu