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Much research has been done on structures equivalent to topological or simplicial groups. In this paper, we consider instead simplicial monoids. In particular, we show that the usual model category structure on the category of simplicial…

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

We provide a short and reasonably self-contained proof of Lurie's straightening equivalence, relating cartesian fibrations over a given $\infty$-category $S$ with contravariant functors from $S$ to the $\infty$-category of small…

Category Theory · Mathematics 2024-12-23 Fabian Hebestreit , Gijs Heuts , Jaco Ruit

Grothendieck fibrations provide a unifying algebraic framework that underlies the treatment of various form of logics, such as first order logic, higher order logics and dependent type theories. In the categorical approach to logic proposed…

Category Theory · Mathematics 2020-09-28 Jacopo Emmenegger , Fabio Pasquali , Giuseppe Rosolini

In this article the author endows the functor category [B(Z2),Gpd] with the structure of a type-theoretic fibration category with a univalent universe using the so-called injective model structure. It gives us a new model of Martin-L\"of…

Category Theory · Mathematics 2017-12-12 Anthony Bordg

In a previous work, by extending the classical Quillen construction to the non-simply connected case, we have built a pair of adjoint functors, 'model' and 'realization', between the categories of simplicial sets and complete differential…

Algebraic Topology · Mathematics 2018-10-22 Urtzi Buijs , Yves Félix , Aniceto Murillo , Daniel Tanré

This paper defines double fibrations (fibrations of double categories) and describes their key examples and properties. In particular, it shows how double fibrations relate to existing fibrational notions such as monoidal fibrations and…

Category Theory · Mathematics 2022-05-31 Geoffrey Cruttwell , Michael Lambert , Dorette Pronk , Martin Szyld

We prove that the homotopy theory of cofibration categories is equivalent to the homotopy theory of cocomplete quasicategories. This is achieved by presenting both homotopy theories as fibration categories and constructing an explicit…

Algebraic Topology · Mathematics 2014-11-04 Karol Szumiło

We discuss right fibrations in the $\infty$-categorical context of Segal objects in a category V and prove some basic results about these.

Algebraic Topology · Mathematics 2017-11-28 Pedro Boavida de Brito

On the category of bisimplicial sets there are different Quillen closed model structures associated to various definitions of fibrations. In one of them, which is due to Bousfield and Kan and that consists of seeing a bisimplicial set as a…

Algebraic Topology · Mathematics 2007-06-29 Antonio Cegarra , Remedios Gomez

We present the first definition of strictly associative and unital $\infty$-category. Our proposal takes the form of a type theory whose terms describe the operations of such structures, and whose definitional equality relation enforces…

Category Theory · Mathematics 2024-07-08 Eric Finster , Alex Rice , Jamie Vicary

The field of directed type theory seeks to design type theories capable of reasoning synthetically about (higher) categories, by generalizing the symmetric identity types of Martin-L\"of Type Theory to asymmetric hom-types. We articulate…

Category Theory · Mathematics 2025-10-21 Thorsten Altenkirch , Jacob Neumann

Lie $\infty$-groupoids are simplicial Banach manifolds that satisfy an analog of the Kan condition for simplicial sets. An explicit construction of Henriques produces certain Lie $\infty$-groupoids called `Lie $\infty$-groups' by…

Algebraic Topology · Mathematics 2020-06-03 Christopher L. Rogers , Chenchang Zhu

The nth symmetric product of a Riemann surface carries a natural family of Kaehler forms, arising from its interpretation as a moduli space of abelian vortices. We give a new proof of a formula of Manton-Nasir for the cohomology classes of…

Symplectic Geometry · Mathematics 2011-11-09 T. Perutz

We use the terms "$\infty$-categories" and "$\infty$-functors" to mean the objects and morphisms in an "$\infty$-cosmos." Quasi-categories, Segal categories, complete Segal spaces, naturally marked simplicial sets, iterated complete Segal…

Category Theory · Mathematics 2019-09-23 Emily Riehl , Dominic Verity

We construct, using finitely many generating cell and relations, props in the category of CW-complexes with the property that their associated operads are models for the $E_\infty$-operad. We use one of these to construct a cellular…

Algebraic Topology · Mathematics 2020-12-21 Anibal M. Medina-Mardones

We introduce and study a notion of cylinder coherator similar to the notion of Grothendieck coherator which define more flexible notion of weak infinity groupoids. We show that each such cylinder coherator produces a combinatorial…

Category Theory · Mathematics 2016-09-16 Simon Henry

In Quillen's paper on rational homotopy theory, the category of 1-reduced simplicial sets is endowed with a family of model structures, the most prominent of which is the one in which the weak equivalences are the rational homotopy…

Algebraic Topology · Mathematics 2026-02-13 Eleftherios Chatzitheodoridis

We develop the theory of (op)fibrations of 2-multicategories and use it to define abstract six-functor-formalisms. We also give axioms for Wirthm\"uller and Grothendieck formalisms (where either $f^!=f^*$ or $f_!=f_*$) or intermediate…

Algebraic Geometry · Mathematics 2017-03-01 Fritz Hörmann

Extending the model of the interval, we explicitly define for each $n\ge 0$ a free complete differential graded Lie algebra $\mathfrak{L}_n$ generated by the simplices of $\Delta^n$, with desuspended degrees, in which the vertices are…

Algebraic Topology · Mathematics 2021-01-11 Urtzi Buijs , Yves Félix , Aniceto Murillo , Daniel Tanré

We develop a constructive model of homotopy type theory in a Quillen model category that classically presents the usual homotopy theory of spaces. Our model is based on presheaves over the cartesian cube category, a well-behaved…

Algebraic Topology · Mathematics 2026-04-21 Steve Awodey , Evan Cavallo , Thierry Coquand , Emily Riehl , Christian Sattler
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