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In the context of operator-space modules over C*-algebras, we give a complete characterisation of those C*-correspondences whose associated Haagerup tensor product functors admit left adjoints. The characterisation, which builds on previous…

Operator Algebras · Mathematics 2017-02-08 Tyrone Crisp

Galois connections were introduced by Ore and have proved useful in a wide variety of mathematical areas. While Galois connections play on the ground of posets (or more generally of quasiordered sets or qosets), we extend this notion to…

General Mathematics · Mathematics 2022-05-02 Paul Poncet

In this paper we develop a differential Galois theory for algebraic Lie-Vessiot systems in algebraic homogeneous spaces. Lie-Vessiot systems are non autonomous vector fields that are linear combinations with time-dependent coefficients of…

Classical Analysis and ODEs · Mathematics 2009-01-29 David Blázquez-Sanz , Juan José Morales-Ruiz

The fundamental construction underlying descent theory, the lax descent category, comes with a functor that forgets the descent data. We prove that, in any $2$-category $\mathfrak{A} $ with lax descent objects, the forgetful morphisms…

Category Theory · Mathematics 2021-05-21 Fernando Lucatelli Nunes

When a category $\mathcal{C}$ satisfies certain conditions, we define the notion of rank invariant for arbitrary poset-indexed functors $F:\mathbf{P} \rightarrow \mathcal{C}$ from a category theory perspective. This generalizes the standard…

Algebraic Topology · Mathematics 2021-08-10 Woojin Kim , Facundo Memoli

In this paper, we associate Galois representations to globally generic cuspidal automorphic representations on GSp(4), over a totally real field F, which are Steinberg at some finite place. This association is compatible with the local…

Number Theory · Mathematics 2008-07-01 Claus M. Sorensen

This paper gives an expository account of our experiments concerning relations between modular forms for congruence subgroups of SL(3,Z) and three dimensional Galois representations. The main new result presented here is a calculation of…

Number Theory · Mathematics 2008-02-03 Bert van Geemen , Jaap Top

The Chern-Galois theory is developed for corings or coalgebras over non-commutative rings. As the first step the notion of an entwined extension as an extension of algebras within a bijective entwining structure over a non-commutative ring…

Rings and Algebras · Mathematics 2008-11-01 Gabriella Böhm , Tomasz Brzezinski

We study certain new relative trace formulas on (non-reductive) period integrals involving Weil representations, in the context of the relative Langlands program. We study normal representatives using Galois theory, and establish geometric…

Number Theory · Mathematics 2025-11-04 Weixiao Lu , Danielle Wang , Zhiyu Zhang

We introduce iposets---posets with interfaces---equipped with a novel gluing composition along interfaces and the standard parallel composition. We study their basic algebraic properties as well as the hierarchy of gluing-parallel posets…

Formal Languages and Automata Theory · Computer Science 2019-10-15 Uli Fahrenberg , Christian Johansen , Georg Struth , Ratan Bahadur Thapa

In this paper we study adjunction relations between some natural functors on the representation category of the category of finite linearly ordered sets and order-preserving injections. We also prove that the Nakayama functor induces an…

Representation Theory · Mathematics 2021-02-10 Wee Liang Gan , Liping Li

In order theory, partially ordered sets are only equipped with one relation which decides the entire structure/Hasse diagram of the set. In this paper, we have presented how partially ordered sets can be studied under simultaneous partially…

General Mathematics · Mathematics 2023-07-03 Omprakash Atale

Consider a reductive group G over a non-archimedean local field. The Galois group Gal(C/Q) acts naturally on the category of smooth complex G-representations. We prove that this action stabilizes the class of standard modules. This…

Representation Theory · Mathematics 2025-12-23 Maarten Solleveld

The recently introduced model of representations has been defined and motivated somewhat ex-nihilo. In this document, I will show that representations are related to a more ''classical'' model through a 2-adjunction. The target model is…

Logic in Computer Science · Computer Science 2026-04-21 Paul Brunet

Given a pair of n-dimensional complex Galois representations over Q, we define their matching density to be the density, if it exists, of the set of places at which the traces of Frobenius of the two Galois representations are equal. We…

Number Theory · Mathematics 2015-01-30 Nahid Walji

In a finite real reflection group, the reflection length of each element is equal to the codimension of its fixed space, and the two coincident functions determine a partial order structure called the absolute order. In complex reflection…

Combinatorics · Mathematics 2025-05-20 Joel Brewster Lewis , Jiayuan Wang

Let $G$ be a finite classical group of Lie type of rank $\ell$, defined over a field of characteristic $p>2$. In this work, we classify the irreducible representations of $G$ whose dimensions are bounded by a constant proportional to…

Representation Theory · Mathematics 2025-11-19 Luis Gutiérrez Frez , Adrian Zenteno

We propose a classification of symmetric conservative clones with a finite carrier. For the study, we use the functional Galois connection $(Inv_Q, Pol_Q)$, which is a natural modification of the connection $(Inv, Pol)$ based on the…

Logic · Mathematics 2018-10-09 Nikolay L. Polyakov

We apply poset cocalculus, a functor calculus framework for functors out of a poset, to study the problem of decomposing multipersistence modules into simpler components. We both prove new results in this topic and offer a new perspective…

Algebraic Topology · Mathematics 2025-10-09 Bjørnar Gullikstad Hem

Let $p\geq 7$ be a prime and $n>1$ be a natural number. We show that there exist infinitely many Galois representations $\varrho:Gal(\bar{\mathbb{Q}}/\mathbb{Q})\rightarrow GL_{n}(\mathbb{Z}_p)$ which are unramified outside $\{p, \infty\}$…

Number Theory · Mathematics 2023-09-08 Anwesh Ray