# Mathematics Colloquia and Seminars

### Higher genus Catalan numbers and the Eynard-Orantin recursion

Algebra & Discrete Mathematics

 Speaker: Motohico Mulase, UC Davis Location: 2112 MSB Start time: Tue, May 1 2012, 2:10PM

The Catalan numbers have many different definitions, and accordingly, many different generalizations. In this talk we present a generalization from the point of view of map enumeration. We derive a simple recursion equation that is a straightforward extension of the Catalan recursion formula. The Laplace transform of this equation is equivalent to the Eynard-Orantin recursion formula, which is a universal B-model formalism that appears in the Remodeling Conjecture in topological string theory/Gromov-Witten theory. The higher genus Catalan numbers give the dimensions of algebras defined by modifying the construction of the Temperley-Lieb algebras. The talk is based on my joint papers with Dumitrescu, Safnuk, Sorkin, and others.