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K-State Today

March 30, 2017

Mathematics Colloquium Lecture March 30

By Reta McDermott

David Nadler, University of California, Berkeley, will present "Higher Ribbon Graphs" as part of the Mathematics Department Colloquium Lecture series at 2:30 p.m. Thursday, March 30, in 102 Cardwell Hall.

Abstract: 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 a proposal for such a higher-dimensional theory, and in particular, what kind of topological spaces might generalize graphs. Time permitting, we also will discuss applications, including to the calculation of symplectic invariants.

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