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We introduce a notion of strong periodicity of a module over a finite-dimensional algebra over a field. We prove that the existence of such modules over certain idempotent algebras is both a necessary and sufficient condition for the…

Representation Theory · Mathematics 2025-01-16 Alfred Dabson

Let k be a field of characteristic p>0. A theorem of de Jong shows that morphisms of modules over W(k)[[t]] with Frobenius and connection structure descend from the completion of W(k)((t)). A careful reading of de Jong's proof suggests the…

Number Theory · Mathematics 2007-05-23 Kiran S. Kedlaya

As a result of impressive research arXiv:2106.07231, D. Garc\'{\i}a-Lucas, \'{A}. del R\'{i}o and L. Margolis defined an infinite series of non-isomorphic $2$-groups $G$ and $H$, whose group algebras $\mathbb{F}G$ and $\mathbb{F}H$ over the…

Group Theory · Mathematics 2024-08-13 Czesław Bagiński , Kamil Zabielski

Classifying obstructions to the problem of finding extensions between two fixed modules goes back at least to L. Illusie's thesis. Our approach, following in the footsteps of J. Wise, is to introduce an analogous Grothendieck Topology on…

Algebraic Geometry · Mathematics 2017-12-06 Leo Herr

We prove strong convergence results for the motivic Adams spectral sequence of the sphere spectrum over fields with finite virtual cohomological dimension at the prime 2, and over arbitrary fields at odd primes. We show that the motivic…

Algebraic Topology · Mathematics 2019-01-14 Jonas Irgens Kylling , Glen Matthew Wilson

In this paper, a family of non-weight modules over Lie superalgebras $S(q)$ of Block type are studied. Free $U(\eta)$-modules of rank $1$ over Ramond-Block algebras and free $U(\mathfrak{h})$-modules of rank $2$ over Neveu-Schwarz-Block…

Representation Theory · Mathematics 2021-01-27 Yucai Su , Xiaoqing Yue , Xiaoyu Zhu

A relationship between nilpotency and primeness in a module is investigated. Reduced modules are expressed as sums of prime modules. It is shown that presence of nilpotent module elements inhibits a module from possessing good structural…

Rings and Algebras · Mathematics 2018-12-12 David Ssevviiri

It is shown that contrary to claims of Ref. [1] the formulated in the proper physical variables Low theorem [2] for soft photon emission does not require any modification. We also reject the criticism in Ref. [1] of the papers [3,4]. At the…

High Energy Physics - Phenomenology · Physics 2024-03-20 V. S. Fadin , V. A. Khoze

This note is a survey on the basic aspects of moduli theory along with some examples. In that respect, one of the purposes of this current document is to understand how the introduction of stacks circumvents the non-representability problem…

Algebraic Geometry · Mathematics 2022-02-15 Kadri İlker Berktav

In this paper, we produce a cellular motivic spectrum of motivic modular forms over $\R$ and $\C$, answering positively to a conjecture of Dan Isaksen. This spectrum is constructed to have the appropriate cohomology, as a module over the…

Algebraic Topology · Mathematics 2017-04-26 Nicolas Ricka

Working in the context of symmetric spectra, we prove higher homotopy excision and higher Blakers-Massey theorems, and their duals, for algebras and left modules over operads in the category of modules over a commutative ring spectrum…

Algebraic Topology · Mathematics 2016-05-06 Michael Ching , John E. Harper

We introduce a theory of modules over a representation of a small category taking values in entwining structures over a semiperfect coalgebra. This takes forward the aim of developing categories of entwined modules to the same extent as…

Category Theory · Mathematics 2022-07-19 Abhishek Banerjee

This is a contribution to the theory of atoms in abelian categories recently developed in a series of papers by Kanda. We present a method that enables one to explicitly compute the atom spectrum of the module category over a wide range of…

Rings and Algebras · Mathematics 2018-09-27 Rune Harder Bak , Henrik Holm

We construct an action of a free resolution of the Frobenius properad on the differential forms of a closed oriented manifold. As a consequence, the forms of a manifold with values in a semi-simple Lie algebra have an additional structure…

Quantum Algebra · Mathematics 2014-04-11 Scott O. Wilson

We study module like objects over categorical quotients of algebras by the action of coalgebras with several objects. These take the form of ``entwined comodules'' and ``entwined contramodules'' over a triple $(\mathscr C,A,\psi)$, where…

Category Theory · Mathematics 2024-10-24 Abhishek Banerjee , Surjeet Kour

We consider the question which potentials in the action of a (1+1) dimensional scalar field theory allowing for spontaneous symmetry breaking have quantum fluctuations corresponding to reflectionless scattering data. The general problem of…

High Energy Physics - Theory · Physics 2008-11-26 M. Bordag , A. Yurov

In this paper we report on recent results by several authors, on the spectral theory of lens spaces and orbifolds and similar locally symmetric spaces of rank one. Most of these results are related to those obtained by the authors in [IMRN…

Differential Geometry · Mathematics 2021-08-11 Emilio A. Lauret , Roberto J. Miatello , Juan Pablo Rossetti

We prove that the stably free modules over a smooth affine threefold over an algebraically closed field of characteristic different from 2 are free.

Commutative Algebra · Mathematics 2019-12-19 Jean Fasel

The ancillary file Corrigendum.pdf contains an explanation why our proof does not work.

Discrete Mathematics · Computer Science 2019-09-16 Volker Kaibel , Jon Lee , Matthias Walter , Stefan Weltge

Let $\Lambda$ be a radical square zero Nakayama algebra with $n$ simple modules and let $\Gamma$ be the Auslander algebra of $\Lambda$. Then every indecomposable direct summand of a tilting $\Gamma$-module is either simple or projective.…

Representation Theory · Mathematics 2020-10-15 Xiaojin Zhang