A Thomason Model Structure on the Category of Small n-fold Categories

Details A Thomason Model Structure on the Category of Small n-fold Categories A Thomason Model Structure on the Category of Small n-fold Categories

2008-08-29

arxiv.org/abs/0808.4108v2

Mathematics

Algebraic Topology

More details added. 23 new pages for a total of 77 pages.

Scientific paper

We construct a cofibrantly generated Quillen model structure on the category of small n-fold categories and prove that it is Quillen equivalent to the standard model structure on the category of simplicial sets. An n-fold functor is a weak equivalence if and only if the diagonal of its n-fold nerve is a weak equivalence of simplicial sets. This is an n-fold analogue to Thomason's Quillen model structure on Cat. We introduce an n-fold Grothendieck construction for multisimplicial sets, and prove that it is a homotopy inverse to the n-fold nerve. As a consequence, we completely prove that the unit and counit of the adjunction between simplicial sets and n-fold categories are natural weak equivalences.

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