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We compute explicitly the submodule structure of the Young modules for symmetric groups $S_n$ over fields of characteristic 2, when $n \le 7$. We use this information to compute the submodule structure of indecomposable projectives for the…

Representation Theory · Mathematics 2020-11-26 Moriah Elkin , Peter Webb

We classify generalized tilting modules and full exceptional sequences for the family of quasi-hereditary quotients of type A zig-zag algebras and for a related family of algebras. We also give a characterization of these quotients as…

Representation Theory · Mathematics 2020-01-10 Elin Persson Westin

We give an explicit formula for the correspondence between simple Yetter-Drinfeld modules for certain finite-dimensional pointed Hopf algebras $H$ and those for cocycle twists $H^{\sigma}$ of $H$. This implies an equivalence between modules…

Quantum Algebra · Mathematics 2009-10-27 Georgia Benkart , Mariana Pereira , Sarah Witherspoon

We study twisted modules for (weak) quantum vertex algebras and we give a conceptual construction of (weak) quantum vertex algebras and their twisted modules. As an application we construct and classify irreducible twisted modules for a…

Quantum Algebra · Mathematics 2008-12-18 Haisheng Li , Shaobin Tan , Qing Wang

We give a category theoretic approach to several known equivalences from (classic) tilting theory and commutative algebra. Furthermore, we apply our main results to establish a duality theory for relative Cohen-Macaulay modules in the sense…

Commutative Algebra · Mathematics 2017-10-25 Olgur Celikbas , Henrik Holm

We study certain special tilting and cotilting modules for an algebra with positive dominant dimension, each of which is generated or cogenerated (and usually both) by projective-injectives. These modules have various interesting…

Representation Theory · Mathematics 2023-06-22 Matthew Pressland , Julia Sauter

In this paper we study mixed Hodge structures on the cohomology of locally symmetric varieties and give an application to modular forms. After proving vanishing of some Hodge numbers, we focus on the weight filtration on the last Hodge…

Algebraic Geometry · Mathematics 2024-08-13 Shouhei Ma

We study infinite dimensional tilting modules over a concealed canonical algebra of domestic or tubular type. In the domestic case, such tilting modules are constructed by using the technique of universal localization, and they can be…

Representation Theory · Mathematics 2019-11-07 Lidia Angeleri Hügel , Dirk Kussin

We construct families of representations for quantum groups over $\mathbb{Z}[v,v^{-1}]$-algebras that interpolate between Weyl modules and tilting modules. These families might be candidates for objects with characters satisfying the {\em…

Representation Theory · Mathematics 2021-12-09 Peter Fiebig

We investigate some relations between the duality and the topological filtration in algebraic K-theory. As a result, we obtain a construction of the first Steenrod square for Chow groups modulo two of varieties over a field of arbitrary…

Algebraic Geometry · Mathematics 2013-11-14 Olivier Haution

We develop a general framework for studying relative weight representations for certain pairs consisting of an associative algebra and a commutative subalgebra. Using these tools we describe projective and simple weight modules for quantum…

Representation Theory · Mathematics 2018-12-06 Vyacheslav Futorny , Laurent Rigal , Andrea Solotar

Let G be a linear algebraic group over an algebraically closed field of characteristic p whose corresponding root system is irreducible. In this paper we calculate the Weyl filtration dimension of the induced G-modules, \nabla(\lambda) and…

Representation Theory · Mathematics 2007-05-23 Alison E. Parker

Let $U_q$ denote the quantum group associated with a finite dimensional semisimple Lie algebra. Assume that $q$ is a complex root of unity of odd order and that $U_q$ is %the quantum group version obtained via Lusztig's $q$-divided powers…

Representation Theory · Mathematics 2009-09-17 Henning Haahr Andersen , Masaharu Kaneda

Peach introduced rhombal algebras associated to quivers given by tilings of the plane by rhombi. We develop general techniques to analyse rhombal algebras, including a filtration by what we call rhombus modules. We introduce a way to relate…

Representation Theory · Mathematics 2007-10-16 Alex Clark , Karin Erdmann , Sibylle Schroll

We study the Nichols algebra of a semisimple Yetter-Drinfeld module and introduce new invariants such as real roots. The crucial ingredient is a `reflection' in the class of such Nichols algebras. We conclude the classifications of…

Quantum Algebra · Mathematics 2009-02-04 N. Andruskiewitsch , I. Heckenberger , H. -J. Schneider

Let $U_l$ be a quantum group at an $l$th root of unity. Many tilting modules for $U_l$ have been shown to have what we call a balanced semisimple filtration, or a Loewy series whose semisimple layers are symmetric about some middle layer.…

Representation Theory · Mathematics 2015-10-12 Amit Hazi

It is demonstrated that any almost-tilting module over a gentle algebra is indeed partial-tilting, meaning it can be completed as a tilting module. Furthermore, such a module has at most $2n$ possible complements, thereby confirming a…

Representation Theory · Mathematics 2025-05-01 Wen Chang

In this paper the authors provide a complete answer to Donkin's Tilting Module Conjecture for all rank $2$ semisimple algebraic groups and $\text{SL}_{4}(k)$ where $k$ is an algebraically closed field of characteristic $p>0$. In the…

Representation Theory · Mathematics 2022-04-18 Christopher P. Bendel , Daniel K. Nakano , Cornelius Pillen , Paul Sobaje

We investigate weight modules for finite and infinite Weyl algebras, classifying all such simple modules. We also study the representation type of the blocks of locally-finite weight module categories and describe indecomposable modules in…

Rings and Algebras · Mathematics 2007-05-23 Viktor Bekkert , Georgia Benkart , Vyacheslav Futorny

We study cluster tilting modules in mesh algebras of Dynkin type, providing a new proof for their existence. In all but one case, we show that these are precisely the maximal rigid modules, and that they are equivariant for a certain…

Representation Theory · Mathematics 2020-07-03 Karin Erdmann , Sira Gratz , Lisa Lamberti