Title: Mock modular forms from meromorphic Jacobi forms

Abstract: Mock modular forms (mock theta functions) were first discussed by Ramanujan over a century ago, but only in this millennium, due to work of S. Zwegers and others, has a theory been developed. I will present a theorem which shows how mock modular forms appear from meromorphic Jacobi forms (after settiing up the various elements). This is based on joint work with A. Dabholkar and D. Zagier, and meant as a taster of one problem relating physics and number theory. The discussion will be at an elementary level. Over tea, I would be happy to discuss in more detail the relevance of this theorem in physics and also other problems relating physics and number theory.