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For any graded commutative noetherian ring, where the grading group is abelian and where commutativity is allowed to hold in a quite general sense, we establish an inclusion-preserving bijection between, on the one hand, the twist-closed…

Category Theory · Mathematics 2012-11-07 Ivo Dell'Ambrogio , Greg Stevenson

We show that trivial extensions of gentle tree algebras are exactly Brauer tree algebras without exceptional vertex. We also give a characterization for the algebras whose trivial extensions are Brauer line/star/cycle algebras. As a…

Representation Theory · Mathematics 2025-03-14 Qi Wang , Yingying Zhang

Taking into account the theoretical results and guidelines given inthis work, we introduce a computational method to construct any 2 step nilpotent quadratic algebra of d generators. Along the work we show that the key of the classification…

Rings and Algebras · Mathematics 2023-07-11 Pilar Benito , Daniel de-la-Concepción , Jorge Roldán-López , Iciar Sesma

We classify localising subcategories of the stable module category of a finite group that are closed under tensor product with simple (or, equivalently all) modules. One application is a proof of the telescope conjecture in this context.…

Representation Theory · Mathematics 2011-04-18 Dave Benson , Srikanth B. Iyengar , Henning Krause

We show that every higher Auslander algebra $A_{n+1}^d$ of type $\mathbb{A}$ such that $\gcd(n,d)=1$ is derived equivalent to a certain replicated algebra $B=B_0^{(n+d)}$. Moreover ${\rm{gldim}} B = nd$ and $B$ admits an $nd$-cluster…

Representation Theory · Mathematics 2025-12-01 Wei Xing

In this paper we give a complete classification of cyclically graded semisimple Lie algebras that afford cuspidal character sheaves and determine the support of the cuspidal character sheaves. This constitutes a major step towards the…

Representation Theory · Mathematics 2025-12-24 Wille Liu , Kari Vilonen , Ting Xue

This paper is the first part of a series that intends to study the resolving subcategories for gentle algebras over an algebraically closed field $\mathbb{K}$. In a general setting, we improve the precision of an algorithm from Takahashi…

Representation Theory · Mathematics 2025-10-06 Benjamin Dequêne , Michaël Schoonheere

We classify, up to isomorphism, all gradings by an arbitrary abelian group on simple finitary Lie algebras of linear transformations (special linear, orthogonal and symplectic) on infinite-dimensional vector spaces over an algebraically…

Rings and Algebras · Mathematics 2012-12-04 Yuri Bahturin , Matej Brešar , Mikhail Kochetov

In this paper we study subalgebras of complex finite dimensional evolution algebras. We obtain the classification of nilpotent evolution algebras whose any subalgebra is an evolution subalgebra with a basis which can be extended to a…

Rings and Algebras · Mathematics 2014-12-08 L. M. Camacho , A. Kh. Khudoyberdiyev , B. A. Omirov

Let $X$ be any rational surface. We construct a tilting bundle $T$ on $X$. Moreover, we can choose $T$ in such way that its endomorphism algebra is quasi-hereditary. In particular, the bounded derived category of coherent sheaves on $X$ is…

Algebraic Geometry · Mathematics 2017-06-27 Lutz Hille , Markus Perling

We classify subalgebras of the complex simple Lie algebra of type G2 up to conjugacy (by an inner automorphism).

Algebraic Geometry · Mathematics 2016-11-15 Evgeny Mayanskiy

In this paper we calculate the Hochschild cohomology of gentle $A_\infty$-algebras of arc collections on marked surfaces without boundary components. When the underlying arc collection has no loops or two-cycles, we show that the dgla…

Rings and Algebras · Mathematics 2025-01-08 Raf Bocklandt , Jasper van de Kreeke

We compute the Hochschild and negative cyclic homology of the nodal curves, and we show that the (noncommutative) Hodge to de Rham spectral sequence degenerates at the second page. We also classify all the Hochschild classes that can be…

Algebraic Geometry · Mathematics 2025-03-19 Yunfan He

We give an explicit description of the set of all factorization structures, or twisting maps, existing between the algebras k^2 and k^2, and classify the resulting algebras up to isomorphism. In the process we relate several different…

Rings and Algebras · Mathematics 2016-08-16 Javier López Peña , Gabriel Navarro

The generators and commutation relations are calculated explicitly for higher symmetry algebras of a class of hyperbolic Euler-Lagrange systems of Liouville type (in particular, for 2D Toda chains associated with semi-simple complex Lie…

Exactly Solvable and Integrable Systems · Physics 2010-03-16 Arthemy V. Kiselev , Johan W. van de Leur

We classify a class of infinite-dimensional simple graded pre-Lie algebras on the graded vector space underlying the algebra of Laurent polynomials, with a specific form for the product.

Rings and Algebras · Mathematics 2007-05-23 Frederic Chapoton

We provide a clarification of the classification of two-dimensional algebras over an arbitrary base field. Using this clarification, we determine the number of non-isomorphic two-dimensional algebras over a finite field.

Rings and Algebras · Mathematics 2026-05-26 U. Bekbaev

All deformations of two dimensional centrally extended Galilei group are classified. The corresponding quantum Lie algebras are found.

Quantum Algebra · Mathematics 2011-09-22 Anna Opanowicz

We determine derived representation type of complete finitely generated local and two-point algebras over an algebraically closed field.

Representation Theory · Mathematics 2008-12-31 Viktor Bekkert , Yuriy Drozd , Vyacheslav Futorny

In this article we describe the triangulated structure of the bounded derived category of a gentle algebra by describing the triangles induced by the morphisms between indecomposable objects in a basis of their Hom-space.

Representation Theory · Mathematics 2020-01-27 Ilke Canakci , David Pauksztello , Sibylle Schroll
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