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Diagrammatic sets admit a notion of internal equivalence in the sense of coinductive weak invertibility, with similar properties to its analogue in strict $\omega$-categories. We construct a model structure whose fibrant objects are…

Algebraic Topology · Mathematics 2024-11-01 Clémence Chanavat , Amar Hadzihasanovic

Much of the homotopical and homological structure of the categories of chain complexes and topological spaces can be deduced from the existence and properties of the 'simple' functors Tot : {double chain complexes} -> {chain complexes} and…

Algebraic Geometry · Mathematics 2008-04-15 Beatriz Rodriguez Gonzalez

We give a homotopy theoretic characterization of stacks on a site $\cC$ as the {\it homotopy sheaves} of groupoids on $\cC$. We use this characterization to construct a model category in which stacks are the fibrant objects. We compare…

Algebraic Topology · Mathematics 2007-08-20 Sharon Hollander

Theorem (after Giraud, SGA 4): Suppose $A$ is a simplicial category. The following conditions are equivalent: (i) There is a cofibrantly generated closed model category $M$ such that $A$ is equivalent to the Dwyer-Kan simplicial…

Algebraic Topology · Mathematics 2007-05-23 Carlos Simpson

We define a model structure on the category GCat of small categories with an action by a finite group G by lifting the Thomason model structure on Cat. We show there is a Quillen equivalence between GCat with this model structure and GTop…

Algebraic Topology · Mathematics 2022-11-15 Anna Marie Bohmann , Kristen Mazur , Angélica M. Osorno , Viktoriya Ozornova , Kate Ponto , Carolyn Yarnall

We define the notion of a multi-sorted algebraic theory, which is a generalization of an algebraic theory in which the objects are of different "sorts." We prove a rigidification result for simplicial algebras over these theories, showing…

Algebraic Topology · Mathematics 2009-05-26 Julia E Bergner

In this paper we study compact closed categories within the context of homotopical algebra. We construct two new model category structures by localizing two (Quillen equivalent) model categories of symmetric monoidal categories with the…

Category Theory · Mathematics 2021-02-26 Amit Sharma

We construct a model structure on the category of cubical sets with connections whose cofibrations are the monomorphisms and whose fibrant objects are defined by the right lifting property with respect to inner open boxes, the cubical…

Algebraic Topology · Mathematics 2022-02-08 Brandon Doherty , Chris Kapulkin , Zachery Lindsey , Christian Sattler

We present an efficient and user-friendly method for constructing any cofibrantly generated model structure on the category of double categories whose trivial fibrations are the "canonical" ones: the double functors which are surjective on…

Algebraic Topology · Mathematics 2025-09-30 Lyne Moser , Maru Sarazola , Paula Verdugo

We present a way of constructing a Quillen model structure on a full subcategory of an elementary topos, starting with an interval object with connections and a certain dominance. The advantage of this method is that it does not require the…

Logic in Computer Science · Computer Science 2018-03-13 Daniil Frumin , Benno van den Berg

We develop a cofibrantly generated model category structure in the category of topological spaces in which weak equivalences are A-weak equivalences and such that the generalized CW(A)-complexes are cofibrant objects. With this structure…

Algebraic Topology · Mathematics 2014-05-12 Miguel Ottina

For a category $\mathcal E$ with finite limits and well-behaved countable coproducts, we construct a model structure, called the effective model structure, on the category of simplicial objects in $\mathcal E$, generalising the Kan--Quillen…

Category Theory · Mathematics 2022-11-11 Nicola Gambino , Simon Henry , Christian Sattler , Karol Szumiło

We give the definitions of model bicategory and $q$-homotopy, which are natural generalizations of the notions of model category and homotopy to the context of bicategories. For any model bicategory $\mathcal{C}$, denote by…

Category Theory · Mathematics 2022-05-06 M. E. Descotte , E. J. Dubuc , M. Szyld

Quillen showed that simplicial sets form a model category (with appropriate choices of three classes of morphisms), which organized the homotopy theory of simplicial sets. His proof is very difficult and uses even the classification theory…

Algebraic Topology · Mathematics 2012-04-19 Hiroshi Kihara

We explain how the notion of homotopy colimits gives rise to that of mapping spaces, even in categories which are not simplicial. We apply the technique of model approximations and use elementary properties of the category of spaces to be…

Algebraic Topology · Mathematics 2014-10-01 W. Chacholski , J. Scherer

We show that Quillen's small object argument works for exact categories under very mild conditions. This has immediate applications to cotorsion pairs and their relation to the existence of certain triangulated adjoint functors and model…

Category Theory · Mathematics 2011-07-28 Manuel Saorin , Jan Stovicek

We prove that any category of props in a symmetric monoidal model category inherits a model structure. We devote an appendix, about half the size of the paper, to the proof of the model category axioms in a general setting. We need the…

Algebraic Topology · Mathematics 2010-02-17 Benoit Fresse

In [3], after defining notions of LS category in the simplicial context, the authors show that the geometric simplicial LS category is non-decreasing under strong collapses. However, they do not give examples where it increases strictly,…

Combinatorics · Mathematics 2017-10-27 Dimitris Askitis

We construct a Quillen model structure on the category of spectral categories, where the weak equivalences are the symmetric spectra analogue of the notion of equivalence of categories.

K-Theory and Homology · Mathematics 2009-02-23 Goncalo Tabuada

We construct Abelian model structures on the category of chain complexes over a ring $R$, from the notion homological dimensions of modules. Given an integer $n > 0$, we prove that the left modules over a ringoid $\mathfrak{R}$ with…

Category Theory · Mathematics 2016-10-31 Marco Pérez
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