Special talk: Yonatan Harpaz (Paris 13) - "Small extensions in algebra and topology"


Yonatan Harpaz (Paris 13)
Abstract: In this talk, we will discuss the notion of small extensions in its various incarnations, from torsors under abelian groups to square-zero extensions of algebras. We will then focus on the somewhat less familiar case of small extensions of ∞-categories. Our main goal is to make this abstract concept concrete and intuitive through a variety of examples. In particular, we will advocate the point of view that small extensions of  ∞-categories offer a unifying perspective in understanding many constructions appearing in obstruction, classification, and deformation theoretic problems


Thu, 12/04/2018 - 13:15 to 14:15


Ross 70