Title: Quasi-invertibility

Abstract

In the theory of differential graded algebras (important in the study of moduli problems in geometry, for example), the correct generalization of invertibility is invertibility up to a boundary, or quasi-invertibility. In this talk, we will explain in what sense the quasi-invertible elements form a "Lie group". In fact, they form a generalization of a group called a higher Lie groupoid.

Location: KdVI meeting room, Science Park 107, room F3.20