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A classification of (countable) direct limits of finite dimensional involution simple associative algebras over an algebraically closed field of arbitrary characteristic is obtained. This also classifies the corresponding dimension groups.…

Rings and Algebras · Mathematics 2013-03-04 Alexander Baranov

We classify irreducible unitary representations of the group of all infinite matrices over a $p$-adic field ($p\ne 2$) with integer elements equipped with a natural topology. Any irreducible representation passes through a group $GL$ of…

Representation Theory · Mathematics 2021-08-24 Yury A. Neretin

In this paper we characterize the sectional category of subgroup inclusions and the $r^{th}$-sequential topological complexity of aspherical spaces of a group G in terms of the A-genus in the sense of Clapp-Puppe and Bartsch for a suitable…

Algebraic Topology · Mathematics 2025-02-18 Arturo Espinosa Baro

We define the notion of 2-filtered 2-category and give an explicit construction of the bicolimit of a category valued 2-functor. A category considered as a trivial 2-category is 2-filtered if and only if it is a filtered category, and our…

Category Theory · Mathematics 2021-03-17 Eduardo J. Dubuc , Ross Street

In our previous papers we introduced categorical invariants, which are, roughly speaking, sets of triangulated subcategories in a given triangulated category and their quotients. Here is extended the list of examples, where these sets are…

Category Theory · Mathematics 2019-07-31 George Dimitrov , Ludmil Katzarkov

In this paper we define a notion of partial APNness and find various characterizations and constructions of classes of functions satisfying this condition. We connect this notion to the known conjecture that APN functions modified at a…

Information Theory · Computer Science 2019-05-31 Lilya Budaghyan , Nikolay S. Kaleyski , Soonhak Kwon , Constanza Riera , Pantelimon Stanica

Category theory is a branch of mathematics that provides a formal framework for understanding the relationship between mathematical structures. To this end, a category not only incorporates the data of the desired objects, but also…

Category Theory · Mathematics 2024-07-26 Niels van der Weide , Nima Rasekh , Benedikt Ahrens , Paige Randall North

We adapt the classical framework of algebraic theories to work in the setting of (infinity,1)-categories developed by Joyal and Lurie. This gives a suitable approach for describing highly structured objects from homotopy theory. A central…

Algebraic Topology · Mathematics 2010-11-16 James Cranch

Inverse categories are categories in which every morphism x has a unique pseudo-inverse y in the sense that xyx=x and yxy=y. Persistence modules from topological data analysis and similarly decomposable category representations factor…

Category Theory · Mathematics 2021-01-15 Sanjeevi Krishnan , Crichton Ogle

We construct the first example of a finitely-presented, residually-finite group that contains an infinite sequence of non-isomorphic finitely-presented subgroups such that each of the inclusion maps induces an isomorphism of profinite…

Group Theory · Mathematics 2015-01-08 Martin R. Bridson

A discrete (finite-difference) analogue of differential forms is considered, defined on simplicial complexes, including triangulations of continuous manifolds. Various operations are explicitly defined on these forms, including exterior…

Geometric Topology · Mathematics 2009-11-13 V. Dolotin , A. Morozov , Sh. Shakirov

We review several known categorification procedures, and introduce a functorial categorification of group extensions with applications to non-abelian group cohomology. Categorification of acyclic models and of topological spaces are briefly…

Category Theory · Mathematics 2007-05-23 Lucian M. Ionescu

Categories of partial functions have become increasingly important principally because of their applications in theoretical computer science. In this note we prove that the category of partial bijections between sets as an…

Discrete Mathematics · Computer Science 2009-03-06 Emil Schwab

We consider a category whose morphisms are bordisms of $n$-dimensional pseudomanifolds equipped with a certain additional structure (coloring). On the other hand, we consider the product $G$ of $(n+1)$ copies of infinite symmetric group. We…

Representation Theory · Mathematics 2018-12-14 Alexander A. Gaifullin , Yury A. Neretin

Lenses, optics and dependent lenses (or equivalently morphisms of containers, or equivalently natural transformations of polynomial functors) are all widely used in applied category theory as models of bidirectional processes. From the…

Category Theory · Mathematics 2021-12-22 Dylan Braithwaite , Matteo Capucci , Bruno Gavranović , Jules Hedges , Eigil Fjeldgren Rischel

We describe the ind- and pro- categories of the category of definable sets, in some first order theory, in terms of points in a sufficiently saturated model.

Logic · Mathematics 2009-08-05 Moshe Kamensky

For a category B with finite products, we first characterize pseudofunctors from B to Cat whose corresponding opfibration is cartesian monoidal. Among those, we then characterize the ones which extend to pseudofunctors from internal groups…

Category Theory · Mathematics 2022-06-03 Alan S. Cigoli , Sandra Mantovani , Giuseppe Metere

In these lecture notes, we give a brief introduction to some elements of category theory. The choice of topics is guided by applications to functional programming. Firstly, we study initial algebras, which provide a mathematical…

Programming Languages · Computer Science 2026-03-09 Benedikt Ahrens , Kobe Wullaert

This paper is a rather informal guide to some of the basic theory of 2-categories and bicategories, including notions of limit and colimit, 2-dimensional universal algebra, formal category theory, and nerves of bicategories. As is the way…

Category Theory · Mathematics 2010-09-10 Stephen Lack

Given symmetric monoidal infinity-categories C and D, subject to mild hypotheses on D, we define an infinity-categorical analog of the Day convolution symmetric monoidal structure on the functor category Fun(C, D). An E_infinity monoid for…

Category Theory · Mathematics 2016-01-08 Saul Glasman