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juschult

Oberseminar Topologie: Emily Riehl (John Hopkins University): Elements of ∞-Category Theory

Wednesday, 05.05.2021 16:00 per ZOOM: Link to Zoom info

Mathematik und Informatik

Abstract: Confusingly for the uninitiated, experts in weak infinite-dimensional category theory make use of different definitions of an ∞-category, and theorems in the ∞-categorical literature are often proven "analytically", in reference to the combinatorial specifications of a particular model. In this talk, we present a new point of view on the foundations of ∞-category theory, which allows us to develop the basic theory of ∞-categories --- adjunctions, limits and colimits, co/cartesian fibrations, and pointwise Kan extensions --- "synthetically" starting from axioms that describe an ∞- *cosmos*, the infinite-dimensional category in which ∞-categories live as objects. We demonstrate that the theorems proven in this manner are "model-independent", i.e., invariant under change of model. Moreover, there is a formal language with the feature that any statement about ∞-categories that is expressible in that language is also invariant under change of model, regardless of whether it is proven through synthetic or analytic techniques. This is joint work with Dominic Verity.



Angelegt am Wednesday, 14.04.2021 12:50 von juschult
Geändert am Tuesday, 04.05.2021 15:39 von boeckena
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