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We give a model-independent construction of directed univalent cocartesian fibrations of $(\infty,1)$-categories, and prove a straightening equivalence against such fibrations. The key step is showing that cocartesian fibrations descend…

Category Theory · Mathematics 2026-03-31 Christian Sattler , David Wärn

We provide a partial solution to the problem of defining a constructive version of Voevodsky's simplicial model of univalent foundations. For this, we prove constructive counterparts of the necessary results of simplicial homotopy theory,…

Category Theory · Mathematics 2022-06-30 Nicola Gambino , Simon Henry

We introduce a notion of a filtered model structure and use this notion to produce various model structures on pro-categories. This framework generalizes several known examples. We give several examples, including a homotopy theory for…

Algebraic Topology · Mathematics 2007-05-23 Halvard Fausk , Daniel C. Isaksen

We show that algebra objects in model categories can be transferred to algebra objects in $\infty$-categories, without any cofibrancy or fibrancy assumptions on the algebra. We furthermore show under some mild extra assumptions that this…

Category Theory · Mathematics 2025-09-18 Inbar Klang , Josefien Kuijper , Cary Malkiewich , David Mehrle , Thor Wittich

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

For a given group $G$ and a collection of subgroups $\mathcal F$ of $G$, we show that there exist a left induced model structure on the category of right $G$-simplicial sets, in which the weak equivalences and cofibrations are the maps that…

Algebraic Topology · Mathematics 2021-02-01 Mehmet Akif Erdal , Aslı Güçlükan İlhan

We characterize the category of Sambin's positive topologies as a fibration over the category of locales Loc. The fibration is obtained by applying the Grothendieck construction to a doctrine over Loc. We then construct an adjunction…

General Topology · Mathematics 2018-12-24 Francesco Ciraulo , Tatsuji Kawai , Samuele Maschio

We investigate functors between abelian categories having a left adjoint and a right adjoint that are \emph{similar} (these functors are called \emph{quasi-Frobenius functors}). We introduce the notion of a \emph{quasi-Frobenius bimodule}…

Rings and Algebras · Mathematics 2008-09-03 F. Castano Iglesias , C. Nastasescu , J. Vercruysse

We provide supplements and open problems related to structure theorems for maximal rationally connected fibrations of certain positively curved projective varieties, including smooth projective varieties with semi-positive holomorphic…

Algebraic Geometry · Mathematics 2022-11-18 Shin-ichi Matsumura

In previous works by the authors, a bifunctor was associated to any operadic twisting morphism, taking a coalgebra over a cooperad and an algebra over an operad, and giving back the space of (graded) linear maps between them endowed with a…

Algebraic Topology · Mathematics 2020-03-02 Daniel Robert-Nicoud , Felix Wierstra

Using the machinery of weak fibration categories due to Schlank and the first author, we construct a convenient model structure on the pro-category of separable $C^*$-algebras $\mathrm{Pro}(\mathtt{SC^*})$. The opposite of this model…

K-Theory and Homology · Mathematics 2017-03-22 Ilan Barnea , Michael Joachim , Snigdhayan Mahanta

Semi-entwining structures are proposed as concepts simpler than entwining structures, yet they are shown to have interesting applications in constructing intertwining operators and braided algebras, lifting functors, finding solutions for…

Quantum Algebra · Mathematics 2013-05-13 Florin F. Nichita , Deepak Parashar , Bartosz Zielinski

We introduce a new model structure on the category of dendroidal spaces, designed to provide a further model for the homotopy theory of $\infty$-operads. This model is directly analogous to a recent construction on the category of…

Algebraic Topology · Mathematics 2026-01-15 João Candeias , Javier J. Gutiérrez

It is known that the so-called monadic decomposition, applied to the adjunction connecting the category of bialgebras to the category of vector spaces via the tensor and the primitive functors, returns the usual adjunction between…

Category Theory · Mathematics 2021-02-15 Alessandro Ardizzoni , Claudia Menini

In this paper, we study Clifford algebra construction from the perspective of adjunctions motivated by the general framework of Krashen and Lieblich. We introduce a category of weighted polynomial laws whose associated Clifford algebra…

Algebraic Geometry · Mathematics 2025-10-28 Nguyen Xuan Bach

Additive models form a widely popular class of regression models which represent the relation between covariates and response variables as the sum of low-dimensional transfer functions. Besides flexibility and accuracy, a key benefit of…

Machine Learning · Statistics 2015-05-20 Alhussein Fawzi , Mathieu Sinn , Pascal Frossard

Consider a cofibrantly generated model category $S$, a small category $C$ and a subcategory $D$ of $C$. We endow the category $S^C$ of functors from $C$ to $S$ with a model structure, defining weak equivalences and fibrations objectwise but…

K-Theory and Homology · Mathematics 2007-05-23 Paul Balmer , Michel Matthey

We show how to "interleave" the monad for operads and the monad for contractions on the category \coll of collections, to construct the monad for the operads-with-contraction of Leinster. We first decompose the adjunction for operads and…

Category Theory · Mathematics 2008-10-06 Eugenia Cheng

Diers developed a general theory of right multi-adjoint functors leading to a purely categorical, point-set construction of spectra. Situations of multiversal properties return sets of canonical solutions rather than a unique one. In the…

Category Theory · Mathematics 2021-04-27 Axel Osmond

We prove that various structures on model $\infty$-categories descend to corresponding structures on their localizations: (i) Quillen adjunctions; (ii) two-variable Quillen adjunctions; (iii) monoidal and symmetric monoidal model…

Algebraic Topology · Mathematics 2015-10-16 Aaron Mazel-Gee
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