涩里番

Title: Ext algebras of subvarieties and formality theorems

Abstract: In this talk I will present ongoing work with Alex Vitanov, in which we use formal geometry methods and a formality theorem to try to describe the Ext algebra of the sheaf associated with a closed embedding of smooth algebraic varieties. I will recall the case of the diagonal embedding, and then explain the two main tools that we use (formality theorems and formal geometry, on which no prior knowledge is assumed).

Location: UQAM PK-5675