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We give a characterization of the sets of objects of the derived category of a block of a finite group algebra (or other symmetric algebra) that occur as the set of images of simple modules under an equivalence of derived categories. We…

Representation Theory · Mathematics 2007-05-23 Jeremy Rickard

We investigate models of algebraic theories in the category of cocommutative coalgebras over a field. We establish some of their categorical properties, similar to those of algebraic varieties. We introduce a class of categories of…

Category Theory · Mathematics 2025-11-12 Maria Bevilacqua

In a previous paper we constructed rank and support variety theories for "quantum elementary abelian groups," that is, tensor products of copies of Taft algebras. In this paper we use both variety theories to classify the thick tensor…

Representation Theory · Mathematics 2015-01-29 Julia Pevtsova , Sarah Witherspoon

It is a well-known result of Etingof, Nikshych and Ostrik that there are finitely many inequivalent integral modular categories of any fixed rank $n$. This follows from a double-exponential bound on the maximal denominator in an Egyptian…

Quantum Algebra · Mathematics 2010-12-09 Paul Bruillard , Eric C. Rowell

Given a Hopf algebra H and an algebra A that is an H-module algebra we consider the category of left H-modules and A-bimodules, where morphisms are just right A-linear maps (not necessarily H-equivariant). Given a twist F of H we then…

Quantum Algebra · Mathematics 2012-10-04 Paolo Aschieri

The classification of finite-dimensional pointed Hopf algebras with group S_3 was finished in "The Nichols algebra of a semisimple Yetter-Drinfeld module", arXiv:0803.2430v1 [math.QA], by Andruskiewitsch, Heckenberger and Schneider: there…

Quantum Algebra · Mathematics 2010-11-09 Agustin Garcia Iglesias

The category-valued trace assigns to a bimodule category over a linear monoidal category a linear category. It generalizes Drinfeld centers of monoidal categories and the relative Deligne product of bimodule categories. In this article, we…

Quantum Algebra · Mathematics 2019-10-22 Vincent Koppen

Let p be a prime, and denote the class of radically graded finite dimensional quasi-Hopf algebras over C, whose radical has codimension p, by RG(p). The purpose of this paper is to continue the structure theory of finite dimensional…

Quantum Algebra · Mathematics 2009-02-01 Pavel Etingof , Shlomo Gelaki

We classify the irreducible representations of a family of finite-dimensional pointed liftings $H_\lambda$ of the Nichols algebra associated with the diagram $A_2$ with parameter $q=-1$. We show that these algebras have infinite…

Quantum Algebra · Mathematics 2025-07-30 Agustín García Iglesias , Alfio Antonio Rodriguez

In this work, it is shown that the category XMod/P of crossed modules over fixed group P is an exact category and the complete proof of the embedding theorem of XMod/P into a set valued functor category is given.

Category Theory · Mathematics 2016-11-26 Ummahan Ege Arslan , GÜlÜmsen Onarli

We classify the localising tensor ideal and colocalising hom-closed subcategories of the stable module category for $\mathrm{LH}\mathfrak{F}$ groups. Along the way we develop techniques to provide similar classifications for other…

Representation Theory · Mathematics 2024-11-01 Gregory Kendall

We define the notion of factorizable quasi-Hopf algebra by using a categorical point of view. We show that the Drinfeld double $D(H)$ of any finite dimensional quasi-Hopf algebra $H$ is factorizable, and we characterize $D(H)$ when $H$…

Quantum Algebra · Mathematics 2007-05-23 Daniel Bulacu , Blas Torrecillas

We study finite-dimensional representations of hyper loop algebras, i.e., the hyperalgebras over an algebraically closed field of positive characteristic associated to the loop algebra over a complex finite-dimensional simple Lie algebra.…

Representation Theory · Mathematics 2008-02-23 Dijana Jakelic , Adriano Moura

We classify finite pointed braided tensor categories admitting a fiber functor in terms of bilinear forms on symmetric Yetter-Drinfeld modules over abelian groups. We describe the groupoid formed by braided equivalences of such categories…

Quantum Algebra · Mathematics 2017-01-04 Costel-Gabriel Bontea , Dmitri Nikshych

A detailed presentation of the results obtained during my Ph.D. research. The main investigations concern explicit descriptions of classes of finite dimensional pointed Hopf algebras and their quasi-isomorphism types.

Quantum Algebra · Mathematics 2009-09-29 Daniel Didt

These are expanded lecture notes from lectures given at the Workshop on higher structures at MATRIX Melbourne. These notes give an introduction to Feynman categories and their applications. Feynman categories give a universal categorical…

Algebraic Topology · Mathematics 2017-06-02 Ralph M. Kaufmann

We construct a family of exact functors from the BGG category of representations of the Lie algebra sl to the category of finite-dimensional representations of the degenerate (or graded) affine Hecke algebra H of GL. These functors…

q-alg · Mathematics 2007-05-23 T. Arakawa , T. Suzuki

Covariant Hom-bimodules are introduced and the structure theory of them in the Hom-setting is studied in a detailed way. The category of bicovariant Hom-bimodules is proved to be a (pre)braided monoidal category and its structure theory is…

Quantum Algebra · Mathematics 2019-05-28 Serkan Karaçuha

We provide isomorphism results for Hopf algebras that are obtained as graded twistings of function algebras on finite groups by cocentral actions of cyclic groups. More generally , we also consider the isomorphism problem for…

Quantum Algebra · Mathematics 2020-03-12 Julien Bichon , Maeva Paradis

We give a review of some recent developments in the theory of tensor categories. The topics include realizability of fusion rings, Ocneanu rigidity, module categories, weak Hopf algebras, Morita theory for tensor categories, lifting theory,…

Quantum Algebra · Mathematics 2009-08-19 Damien Calaque , Pavel Etingof