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Special talk: Yonatan Harpaz (Paris 13) - "Small extensions in algebra and topology" | Einstein Institute of Mathematics

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

Date: 
Thu, 12/04/201813:15-14:15
Location: 
Ross 70
Lecturer: 
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