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This is an exposition of homotopical results on the geometric realization of semi-simplicial spaces. We then use these to derive basic foundational results about classifying spaces of topological categories, possibly without units. The…

Algebraic Topology · Mathematics 2019-08-21 Johannes Ebert , Oscar Randal-Williams

It is shown that the Joyal quasi-category model structure for simplicial sets extends to a model structure on simplicial presheaves, for which the weak equivalences are local (or stalkwise) Joyal equivalences.

Category Theory · Mathematics 2016-07-20 Nicholas Meadows

We construct on the category of diffeological spaces a Quillen model structure having smooth weak homotopy equivalences as the class of weak equivalences.

Algebraic Topology · Mathematics 2024-07-19 Tadayuki Haraguchi , Kazuhisa Shimakawa

In a previous paper we lifted Charles Rezk's complete Segal model structure on the category of simplicial spaces to a Quillen equivalent one on the category of "relative categories," and our aim in this successor paper is to obtain a more…

Algebraic Topology · Mathematics 2011-01-05 C. Barwick , D. M. Kan

In this paper, we construct a model structure for $(\infty,1)$-categories on the category of simplicial spaces, whose fibrant objects are the Segal spaces. In particular, we show that it is Quillen equivalent to the models of…

Algebraic Topology · Mathematics 2025-12-01 Lyne Moser , Joost Nuiten

Consider a diagram of quasi-categories that admit and functors that preserve limits or colimits of a fixed shape. We show that any weighted limit whose weight is a projective cofibrant simplicial functor is again a quasi-category admitting…

Category Theory · Mathematics 2015-03-03 Emily Riehl , Dominic Verity

We prove that for certain monoidal (Quillen) model categories, the category of comonoids therein also admits a model structure.

Category Theory · Mathematics 2010-01-12 Alexandru E. Stanculescu

We investigate under which assumptions a subclass of flat quasi-coherent shea\-ves on a quasi-compact and semi-separated scheme allows to "mock" the homotopy category of projective modules. Our methods are based on module theoretic…

Algebraic Topology · Mathematics 2018-03-06 Sergio Estrada , Alexander Slavik

We construct a model category structure on the category of diffeological spaces which is Quillen equivalent to the model structure on the category of topological spaces based on the notions of Serre fibrations and weak homotopy…

Algebraic Topology · Mathematics 2018-10-10 Tadayuki Haraguchi , Kazuhisa Shimakawa

We show that any closed model category of simplicial algebras over an algebraic theory is Quillen equivalent to a proper closed model category. By ``simplicial algebra'' we mean any category of algebras over a simplicial algebraic theory,…

Algebraic Topology · Mathematics 2008-12-05 Charles Rezk

We prove that each of the model structures for ($n$-trivial, saturated) comical sets on the category of marked cubical sets having only faces and degeneracies (without connections) is Quillen equivalent to the corresponding model structure…

Algebraic Topology · Mathematics 2022-07-19 Brandon Doherty

We introduce the notion of weighted limit in an arbitrary quasi-category, suitably generalizing ordinary limits in a quasi-category, and classical weighted limits in an ordinary category. This is accomplished by generalizing Joyal's…

Algebraic Topology · Mathematics 2019-02-05 Martina Rovelli

Let $n$ be an integer greater or equal than $3$. We give a simultaneous generalization of $(n-2)$-exact categories and $n$-angulated categories, and we call it one-sided $n$-suspended categories. One-sided $n$-angulated categories are also…

Representation Theory · Mathematics 2021-08-31 Jing He , Yonggang Hu , Panyue Zhou

Exact categories are a natural generalisation of abelian categories and provide a fertile ground to develop relative homological algebra. In this paper, starting from a class of relative Gorenstein projective objects in an exact category…

Representation Theory · Mathematics 2026-02-27 Anastasios Slaftsos , Jorge Vitória

We introduce, for \(\C\) a regular Cartesian Reedy category a model category whose fibrant objects are an analogue of quasicategories enriched in simplicial presheaves on \(C\). We then develop a coherent realization and nerve for this…

Category Theory · Mathematics 2019-10-01 Harry Gindi

In this paper we put a cofibrantly generated model category structure on the category of small simplicial categories. The weak equivalences are a simplicial analogue of the notion of equivalence of categories.

Algebraic Topology · Mathematics 2007-05-23 Julia E. Bergner

In this note we show that a semisimplicial set with the weak Kan condition admits a simplicial structure, provided any object allows an idempotent self-equivalence. Moreover, any two choices of simplicial structures give rise to equivalent…

Algebraic Topology · Mathematics 2018-02-27 Wolfgang Steimle

We prove that categories enriched in the Thomason model structure admit a model structure that is Quillen equivalent to the Bergner model structure on simplicial categories, providing a new model for (infinity,1)-categories. Along the way,…

Algebraic Topology · Mathematics 2023-11-20 Dmitri Pavlov

We describe a method for constructing simplicial model structures on ind- and pro-categories. Our method is particularly useful for constructing "profinite" analogues of known model categories. Our construction quickly recovers Morel's…

Algebraic Topology · Mathematics 2023-11-15 Thomas Blom , Ieke Moerdijk

We put a monoidal model category structure on the category of chain complexes of quasi-coherent sheaves over a quasi-compact and semi-separated scheme X. The approach generalizes and simplifies methods used by the author to build monoidal…

Algebraic Topology · Mathematics 2007-05-23 James Gillespie