Type: Seminar

Distribution: World

Expiry: 27 Jun 2019

CalTitle1: Algebra Seminar: A counterexample in quasi-category theory

Auth: kevinc@193-119-95-34.tpgi.com.au (kcou7211) in SMS-WASM

Alexander Campbell (Macquarie University) Friday 31 May, 12-1pm, Place: Carslaw 375 Title: A counterexample in quasi-category theory Abstract: In his pioneering work on the theory of quasi-categories (also known as infinity-categories), Joyal left open the following question: is a morphism of simplicial sets inner anodyne if and only if it is (i) a monomorphism, (ii) bijective on 0-simplices, and (iii) a weak categorical equivalence? In this talk, I will show that the answer to this question is "no" by giving an example of a morphism of simplicial sets which has the properties (i), (ii), and (iii), but which is not inner anodyne. Furthermore, I will use this morphism to refute a plausible description of the fibrations in Joyal’s model structure for quasi-categories.

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