**Special Seminar**

Come join us **Monday February 5, 2018 at 12 pm in RM 507, Professor Georg Oberdeck (MIT) will be giving a special lecture about “Counting in Algebraic Geometry and Modular Forms”.**

**Abstract**

It is generally expected that the enumerative geometry of Calabi-Yau geometries

should be closely related to the theory of modular forms. A basic example

(which I will recall) is the count of uniruled divisors on hyper-Kaehler

manifolds by Fourier coefficients of Jacobi forms. Another interesting but less

understood case is the count of algebraic curves and sheaves on Calabi-Yau

threefolds. I will discuss recent work with A. Pixton and J. Shen which, for a

particularly Calabi-Yau threefold, proves the modularity of its curve counting

partition function using geometric arguments.

**Mathematics Hall, Room 507**

**Monday February 5, 2018 at 12 pm**