# Princeton/IAS Symplectic Geometry Seminar

**Topic: **Higher ribbon graphs

**Speaker: **David Nadler

**Affiliation: **University of California, Berkeley

**Date & Time: **Monday March 12th, 2018, 4:00pm - 5:00pm

**Location: **Simonyi Hall 101

**Video:** https://video.ias.edu/puias/2018/0312-DavidNadler

Ribbon graphs capture the topology of open Riemann surfaces in an elementary combinatorial form. One can hope this is the first step toward a general theory for open symplectic manifolds such as Stein manifolds. We will discuss progress toward such a higher dimensional theory (joint work with Alvarez-Gavela, Eliashberg, and Starkston), and in particular, what kind of topological spaces might generalize graphs. We will also discuss applications to the calculation of symplectic invariants.