|Date: Thursday, March 17, 2022
Location: 4096 East Hall (4:00 PM to 5:20 PM)
Title: On Makkai's Strong Conceptual Completeness Theorem
Abstract: One of the most fundamental results of mathematical logic is the celebrated Godel completeness theorem, which asserts that every consistent first-order theory T admits a model. In the 1980s, Makkai proved a sharper result: any first-order theory T can be recovered, up to a suitable notion of equivalence, from its category of models Mod(T) together with some additional structure (related to the theory of ultraproducts). In this talk, I'll explain the statement of Makkai's theorem and sketch a new proof of it, inspired by the theory of "pro-etale sheaves" developed by Scholze and Bhatt-Scholze.
Speaker: Jacob Lurie