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In this article we develop formal category theory within augmented virtual double categories. Notably we formalise the classical notions of Kan extension, Yoneda embedding $\text y_A\colon A \to \hat A$, exact square, total category and…

Category Theory · Mathematics 2024-04-04 Seerp Roald Koudenburg

We make Hinich's $\infty$-categorical enriched Yoneda embedding natural. To do so, we exhibit it as the unit of a partial adjunction between the functor taking enriched presheaves and Heine's functor taking a tensored category to an…

Category Theory · Mathematics 2024-07-09 Shay Ben-Moshe

The invertibility hypothesis for a monoidal model category S asks that localizing an S-enriched category with respect to an equivalence results in an weakly equivalent enriched category. This is the most technical among the axioms for S to…

Algebraic Topology · Mathematics 2016-02-18 Tyler Lawson

We define the notion of an additive model category, and we prove that any additive, stable, combinatorial model category has a natural enrichment over symmetric spectra based on simplicial abelian groups. As a consequence, every object in…

Algebraic Topology · Mathematics 2007-05-23 Daniel Dugger , Brooke Shipley

In this survey paper we give account of several approaches to the strictification and non-strictification of monoidal categories, which are constructions that turn a monoidal category into a (non-)strict one monoidally equivalent to the…

Category Theory · Mathematics 2024-12-31 Jorge Becerra

We give a detailed account of the theory of enrichment over a bicategory and show that it establishes a two-fold generalization of enrichment over both quantaloids and monoidal categories. We define complete B-categories, a generalization…

Category Theory · Mathematics 2025-07-29 Olivia Caramello , Elio Pivet

We describe a general framework for notions of commutativity based on enriched category theory. We extend Eilenberg and Kelly's tensor product for categories enriched over a symmetric monoidal base to a tensor product for categories…

Category Theory · Mathematics 2016-01-07 Richard Garner , Ignacio López Franco

We introduce the theory of enrichment over an internal monoidal category as a common generalization of both the standard theories of enriched and internal categories. The aim of the paper is to justify and contextualize the new notion by…

Category Theory · Mathematics 2020-06-16 Enrico Ghiorzi

Braided-enriched monoidal categories were introduced in work of Morrison-Penneys, where they were characterized using braided central functors. Recent work of Kong-Yuan-Zhang-Zheng and Dell extended this characterization to an equivalence…

Category Theory · Mathematics 2022-09-02 Zachary Dell , Peter Huston , David Penneys

We give sufficient conditions for the existence of a Quillen model structure on small categories enriched in a given monoidal model category. This yields a unified treatment for the known model structures on simplicial, topological, dg- and…

Algebraic Topology · Mathematics 2016-04-04 Clemens Berger , Ieke Moerdijk

This paper is part of a project that aims to give a homotopy cousin of Kelly's treatment of enriched category theory. After introducing unital co-Segal M-categories, we establish the unital version of a previous theorem that was proven for…

Category Theory · Mathematics 2013-12-31 Hugo V. Bacard

This paper provides a comprehensive overview of some of the foundational properties of categories enriched over quantaloids, along with several new results. We demonstrate that the category whose objects are quantaloid-enriched categories…

Category Theory · Mathematics 2025-10-14 Javier Gutiérrez García , Ulrich Höhle

By introducing the concept of quantaloidal completions for an order-enriched category, relationships between the category of quantaloids and the category of order-enriched categories are studied. It is proved that quantaloidal completions…

Category Theory · Mathematics 2023-06-22 Min Liu , Yulin Li

We develop a theory of infinity properads enriched in a general symmetric monoidal infinity category. These are defined as presheaves, satisfying a Segal condition and a Rezk completeness condition, over certain categories of graphs. In…

Algebraic Topology · Mathematics 2022-03-14 Hongyi Chu , Philip Hackney

We set up a general theory of weak or homotopy-coherent enrichment in an arbitrary monoidal $\infty$-category $\mathcal{V}$. Our theory of enriched $\infty$-categories has many desirable properties; for instance, if the enriching…

Algebraic Topology · Mathematics 2019-11-15 David Gepner , Rune Haugseng

This work is the first one in a series, in which we develop a mathematical theory of enriched (braided) monoidal categories and their representations. In this work, we introduce the notion of the $E_0$-center ($E_1$-center or $E_2$-center)…

Category Theory · Mathematics 2024-07-09 Liang Kong , Wei Yuan , Zhi-Hao Zhang , Hao Zheng

We define the twisted tensor product of two enriched categories, which generalizes various sorts of `products' of algebraic structures, including the bicrossed product of groups, the twisted tensor product of (co)algebras and the double…

Category Theory · Mathematics 2011-12-06 Aura Bârdeş , Dragoş Ştefan

Whereas formal category theory is classically considered within a $2$-category, in this paper a double-dimensional approach is taken. More precisely we develop such theory within the setting of augmented virtual double categories, a notion…

Category Theory · Mathematics 2022-10-11 Seerp Roald Koudenburg

The basic notions of category theory, such as limit, adjunction, and orthogonality, all involve assertions of the existence and uniqueness of certain arrows. Weak notions arise when one drops the uniqueness requirement and asks only for…

Category Theory · Mathematics 2012-05-25 Stephen Lack , Jiri Rosicky

In this work, we establish certain enrichments of dual algebraic structures in the setting of monoidal double categories. In more detail, we obtain a tensored and cotensored enrichment of monads in comonads, as well as a tensored and…

Category Theory · Mathematics 2025-02-04 Vasileios Aravantinos-Sotiropoulos , Christina Vasilakopoulou