• Appl. Categor. Struct. (IF 0.552) Pub Date : 2020-04-30
Dirk Hofmann, Pedro Nora

As composites of constant, finite (co)product, identity, and powerset functors, Kripke polynomial functors form a relevant class of $$\textsf {Set}$$-functors in the theory of coalgebras. The main goal of this paper is to expand the theory of limits in categories of coalgebras of Kripke polynomial functors to the context of quantale-enriched categories. To assume the role of the powerset functor we

更新日期：2020-04-30
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2020-03-07
R. N. Ball, M. A. Moshier, A. Pultr

We prove, for a general frame, that the sublocales that can be represented as joins of closed ones are, somewhat surprisingly, in a natural one-to-one correspondence with the filters closed under exact meets, and explain some subfit facts from this perspective. Furthermore we discuss the filters associated in a similar vein with the fitted sublocales.

更新日期：2020-03-07
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2020-03-06
Jens Hemelaer

Butz and Moerdijk famously showed that every (Grothendieck) topos with enough points is equivalent to the category of sheaves on some topological groupoid. We give an alternative, more algebraic construction in the special case of a topos of presheaves on an arbitrary monoid. If the monoid is embeddable in a group, the resulting topological groupoid is the action groupoid for a discrete group acting

更新日期：2020-03-06
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2020-03-06
Emily Riehl, Dominic Verity

In this paper we prove that various quasi-categories whose objects are $$\infty$$-categories in a very general sense are complete: admitting limits indexed by all simplicial sets. This result and others of a similar flavor follow from a general theorem in which we characterize the data that is required to define a limit cone in a quasi-category constructed as a homotopy coherent nerve. Since all quasi-categories

更新日期：2020-03-06
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2020-03-02
Davide di Micco, Tim Van der Linden

In the context of internal crossed modules over a fixed base object in a given semi-abelian category, we use the non-abelian tensor product in order to prove that an object is perfect (in an appropriate sense) if and only if it admits a universal central extension. This extends results of Brown and Loday (Topology 26(3):311–335, 1987, in the case of groups) and Edalatzadeh (Appl Categ Struct 27(2):111–123

更新日期：2020-03-02
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2020-02-27
Gabriella Böhm

This is the second part of a series of three strongly related papers in which three equivalent structures are studied: Internal categories in categories of monoids; defined in terms of pullbacks relative to a chosen class of spans. Crossed modules of monoids relative to this class of spans. Simplicial monoids of so-called Moore length 1 relative to this class of spans. The most important examples of

更新日期：2020-02-27
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-12-18
Gabriella Böhm

The category of double categories and double functors is equipped with a symmetric closed monoidal structure. For any double category $${\mathbb {A}}$$, the corresponding internal hom functor sends a double category $${\mathbb {B}}$$ to the double category whose 0-cells are the double functors $${\mathbb {A}} \rightarrow {\mathbb {B}}$$, whose horizontal and vertical 1-cells are the horizontal and

更新日期：2019-12-18
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-11-30

We introduce constructible directed complexes, a combinatorial presentation of higher categories inspired by constructible complexes in poset topology. Constructible directed complexes with a greatest element, called atoms, encompass common classes of higher-categorical cell shapes, including globes, cubes, oriented simplices, and a large sub-class of opetopes, and are closed under lax Gray products

更新日期：2019-11-30
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-11-27
Andrea Montoli, Diana Rodelo, Tim Van der Linden

In the context of regular unital categories we introduce an intrinsic version of the notion of a Schreier split epimorphism, originally considered for monoids. We show that such split epimorphisms satisfy the same homological properties as Schreier split epimorphisms of monoids do. This gives rise to new examples of $${\mathcal {S}}$$-protomodular categories, and allows us to better understand the

更新日期：2019-11-27
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-10-30
Shijie Zhu

We study the existence and uniqueness of minimal right determiners in various categories. Particularly in a $${{\,\mathrm{Hom}\,}}$$-finite hereditary abelian category with enough projectives, we prove that the Auslander–Reiten–Smalø–Ringel formula of the minimal right determiner still holds. As an application, we give a formula of minimal right determiners in the category of finitely presented representations

更新日期：2019-10-30
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-10-17
Maurice Kianpi, Jean B. Nganou

We introduce compactly finite MV-algebras and continuous MV-algebras. We also investigate pro-compactly finite MV-algebras, which are the MV-algebras that are inverse limits of systems of compactly finite MV-algebras. We obtain that continuous MV-algebras as well as pro-compactly finite MV-algebras coincide with compact Hausdorff MV-algebras. In addition, further categorical properties of compact Hausdorff

更新日期：2019-10-17
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-10-16
Richard Garner

The Vietoris monad on the category of compact Hausdorff spaces is a topological analogue of the power-set monad on the category of sets. Exploiting Manes’ characterisation of the compact Hausdorff spaces as algebras for the ultrafilter monad on sets, we give precise form to the above analogy by exhibiting the Vietoris monad as induced by a weak distributive law, in the sense of Böhm, of the power-set

更新日期：2019-10-16
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-10-15
Nelson Martins-Ferreira

In this paper we give unified characterizations of categories defined by variations of the Mal’tsev property.

更新日期：2019-10-15
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-10-08
Tobias Fritz, Bas Westerbaan

When formulating universal properties for objects in a dagger category, one usually expects a universal property to characterize the universal object up to unique unitary isomorphism. We observe that this is automatically the case in the important special case of $$\hbox {C}^*$$-categories, provided that one uses enrichment in Banach spaces. We then formulate such a universal property for infinite

更新日期：2019-10-08
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-09-12
James Fullwood

We introduce integral structure types as a categorical analogue of virtual combinatorial species. Integral structure types then categorify power series with possibly negative coefficients in the same way that combinatorial species categorify power series with non-negative rational coefficients. The notion of an operator on combinatorial species naturally extends to integral structure types, and in

更新日期：2019-09-12
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-09-09
Boaz Haberman

For any site of definition $$\mathcal {C}$$ of a Grothendieck topos $$\mathcal {E}$$, we define a notion of a $$\mathcal {C}$$-ary Lawvere theory $$\tau : \mathscr {C} \rightarrow \mathscr {T}$$ whose category of models is a stack over $$\mathcal {E}$$. Our definitions coincide with Lawvere’s finitary theories when $$\mathcal {C}=\aleph _0$$ and $$\mathcal {E} = {{\,\mathrm{\mathbf {Set}}\,}}$$. We

更新日期：2019-09-09
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-09-06
Kenichi Shimizu

Let $${\mathcal {C}}$$ be a finite tensor category, and let $${\mathcal {M}}$$ be an exact left $${\mathcal {C}}$$-module category. The action of $${\mathcal {C}}$$ on $${\mathcal {M}}$$ induces a functor $$\rho : {\mathcal {C}} \rightarrow \mathrm {Rex}({\mathcal {M}})$$, where $$\mathrm {Rex}({\mathcal {M}})$$ is the category of k-linear right exact endofunctors on $${\mathcal {M}}$$. Our key observation

更新日期：2019-09-06
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-08-28
Bruno Chiarellotto, Nicola Mazzari

We compute the Ext group of the (filtered) Ogus category over a number field K. In particular we prove that the filtered Ogus realisation of mixed motives is not fully faithful.

更新日期：2019-08-28
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-08-10
Andrew Polonsky, Patricia Johann

It follows from standard results that if $$\mathcal {A}$$ and $$\mathcal {C}$$ are locally $$\lambda$$-presentable categories and $$F : \mathcal {A}\rightarrow \mathcal {C}$$ is a $$\lambda$$-accessible functor, then the comma category $$\mathsf {Id}_\mathcal {C}{\downarrow }{}F$$ is locally $$\lambda$$-presentable. We show that, under the same hypotheses, \(F{\downarrow }{}\mathsf {Id}_\mathcal

更新日期：2019-08-10
• Appl. Categor. Struct. (IF 0.552) Pub Date : 2019-07-04
R. F. Blute, J. R. B. Cockett, J.-S. P. Lemay, R. A. G. Seely

Differential categories were introduced to provide a minimal categorical doctrine for differential linear logic. Here we revisit the formalism and, in particular, examine the two different approaches to defining differentiation which were introduced. The basic approach used a deriving transformation, while a more refined approach, in the presence of a bialgebra modality, used a codereliction. The latter

更新日期：2019-07-04
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