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A new proof of the classification for tensor ideal thick subcategories of the bounded derived category, and the stable category, of modular representations of a finite group is obtained. The arguments apply more generally to yield a…

Representation Theory · Mathematics 2012-02-01 Jon F. Carlson , Srikanth B. Iyengar

We prove that for each locally $\alpha$-presentable category $\mathcal K$ there exists a regular cardinal $\gamma$ such that any $\alpha$-accessible functor out of $\mathcal K$ (into another locally $\alpha$-presentable category) is…

Category Theory · Mathematics 2022-04-01 Giacomo Tendas

Markov categories have recently turned out to be a powerful high-level framework for probability and statistics. They accommodate purely categorical definitions of notions like conditional probability and almost sure equality, as well as…

Probability · Mathematics 2026-02-12 Tobias Fritz , Tomáš Gonda , Antonio Lorenzin , Paolo Perrone , Dario Stein

We present several equivalent conditions of the continuity of the supremum function from the square of the Scott space of $C(X)$ to itself under mild assumptions, where $C(X)$ denotes the lattice of closed subsets of a $\mathbf{T_0}$…

General Topology · Mathematics 2025-08-12 Yu Chen , Hui Kou , Zhenchao Lyu , Weiyu Yang

We prove that every finite distributive lattice $D$ can be represented as the congruence lattice of a rectangular lattice $K$ in which all congruences are principal. We verify this result in a stronger form as an extension theorem.

Rings and Algebras · Mathematics 2019-08-13 G. Grätzer , E. T. Schmidt

In this paper, it is proved that, for the truth value algebra of interval-valued fuzzy sets, the distributive laws do not imply the monotonicity condition for the set inclusion operation. Then, a lattice-ordered $t_{r}$-norm, which is not…

General Mathematics · Mathematics 2020-04-09 Xinxing Wu , Guanrong Chen

We introduce a notion of partial presentability in parametrized higher category theory and investigate its interaction with the concepts of parametrized semiadditivity and stability from arXiv:2301.08240. In particular, we construct the…

Algebraic Topology · Mathematics 2025-09-19 Bastiaan Cnossen , Tobias Lenz , Sil Linskens

Joyal and Street note in their paper on braided monoidal categories [Braided tensor categories, Advances in Math. 102(1993) 20-78] that the 2-category V-Cat of categories enriched over a braided monoidal category V is not itself braided in…

Category Theory · Mathematics 2014-10-01 Stefan Forcey

If there is a topologically locally constant family of smooth algebraic varieties together with an admissible normal function on the total space, then the latter is constant on any fiber if this holds on some fiber. Combined with spreading…

Algebraic Geometry · Mathematics 2014-11-25 Morihiko Saito

We characterise the Priestley spaces corresponding to affine complete bounded distributive lattices. Moreover we prove that the class of affine complete bounded distributive lattices is closed under products and free products. We show that…

Logic · Mathematics 2007-05-31 Dominic van der Zypen

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

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

We consider the mass-subcritical nonlinear Schr\"odinger equation in all space dimensions with focusing or defocusing nonlinearity. For such equations with critical regularity $s_c\in(\max\{-1,-\frac{d}{2}\},0)$, we prove that any solution…

Analysis of PDEs · Mathematics 2017-07-19 Rowan Killip , Satoshi Masaki , Jason Murphy , Monica Visan

A locally small category E is totally distributive (as defined by Rosebrugh-Wood) if there exists a string of adjoint functors t -| c -| y, where y : E --> E^ is the Yoneda embedding. Saying that E is lex totally distributive if, moreover,…

Category Theory · Mathematics 2012-10-22 Rory B. B. Lucyshyn-Wright

This expository article brings together two subjects: generalised metrics based on enriched categories, on the one hand, and Lorentz manifolds, on the other, at the price of dealing with details that are well known either in category theory…

Category Theory · Mathematics 2026-05-19 Marco Grandis

Classical results for exchangeable systems of random variables are extended to multi-class systems satisfying a natural partial exchangeability assumption. It is proved that the conditional law of a finite multi-class system, given the…

Probability · Mathematics 2008-10-16 Carl Graham

We introduce the notion of a definable category--a category equivalent to a full subcategory of a locally finitely presentable category that is closed under products, directed colimits and pure subobjects. Definable subcategories are…

Category Theory · Mathematics 2016-12-13 Amit Kuber , Jiří Rosický

Given a category $\mathcal C$ and a directed partially ordered set $J$, a certain category $pro^J -\mathcal C$ on inverse systems in $\mathcal C$ is constructed such that the ordinary pro-category $pro-\mathcal C$ is the most special case…

Category Theory · Mathematics 2019-05-20 Nikica Uglešić

An example of a time-invariant time-delay system that is uniformly globally attractive and exponentially stable, hence forward complete, but whose reachability sets from bounded initial conditions are not bounded over compact time intervals…

Systems and Control · Electrical Eng. & Systems 2024-02-13 Jose L. Mancilla-Aguilar , Hernan Haimovich

We describe all left continuous triangular norms for which the category [0,1]-Cat of real-enriched categories and functors is cartesian closed. We furthermore show that the cartesian closedness of [0,1]-Cat is equivalent to the cartesian…

Category Theory · Mathematics 2026-01-27 Hongliang Lai , Qingzhu Luo
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