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In this paper we are concerned with the structure of tame symmetric algebras of period four (TSP4 algebras, for short). We will mostly focus on the case when the Gabriel quiver of $A$ is biserial, i.e. there are at most two arrows ending…

Representation Theory · Mathematics 2023-04-18 Karin Erdmann , Adam Hajduk , Adam Skowyrski

The tame symmetric algebras of period four, TSP4 algebras for short, form an important class of algebras, with interesting links to various branches of modern algebra. The study of this class has been recently developed in two major…

Representation Theory · Mathematics 2026-03-27 Alicja Jaworska-Pastuszak , Adam Skowyrski

In this paper we study the structure of Gabriel quivers of tame symmetric algebras of period four. More precisely, we focus on algebras having Gabriel quiver {\it biregular}, i.e. the numbers of arrows starting and ending at any vertex are…

Representation Theory · Mathematics 2024-11-05 Karin Erdmann , Adam Hajduk , Adam Skowyrski

We introduce and study higher spherical algebras, an exotic family of finite-dimensional algebras over an algebraically closed field. We prove that every such an algebra is derived equivalent to a higher tetrahedral algebra studied in [7],…

Representation Theory · Mathematics 2019-05-09 Karin Erdmann , Andrzej Skowronski

We introduce new symmetric and periodic algebras of period 4, which are tame of non-polynomial growth

Representation Theory · Mathematics 2020-06-24 Adam Skowyrski

This paper provides the next step towards classification of algebras of generalized quaternion type. Previously algebras with 2-regular Gabriel quiver were classified (a quiver is 2-regular if at each vertex, two arrows start and two arrows…

Representation Theory · Mathematics 2026-03-17 Karin Erdmann , Adam Hajduk , Adam Skowyrski

We introduce general weighted surface algebras of triangulated surfaces with arbitrarily oriented triangles and describe their basic properties. In particular, we prove that all these algebras, except the singular disc, triangle,…

Representation Theory · Mathematics 2019-02-13 Karin Erdmann , Andrzej Skowroński

We describe the structure and properties of the finite-dimensional symmetric algebras over an algebraically closed field $K$ which are socle equivalent to the general weighted surface algebras of triangulated surfaces, investigated in…

Representation Theory · Mathematics 2021-08-27 Jerzy Białkowski , Karin Erdmann , Adam Hajduk , Andrzej Skowroński , Kunio Yamagata

We introduce and study the higher tetrahedral algebras, an exotic family of finite-dimensional tame symmetric algebras over an algebraically closed field. The Gabriel quiver of such an algebra is the triangulation quiver associated to the…

Representation Theory · Mathematics 2017-11-28 Karin Erdmann , Andrzej Skowro'nski

The finite-dimensional symmetric algebras over an algebraically closed field, based on surface triangulations, motivated by the theory of cluster algebras, have been extensively investigated and applied. In particular, the weighted surface…

Representation Theory · Mathematics 2020-08-27 Thorsten Holm , Andrzej Skowroński , Adam Skowyrski

We construct a new class of symmetric algebras of tame representation type that are also the endomorphism algebras of cluster tilting objects in 2-Calabi-Yau triangulated categories, hence all their non-projective indecomposable modules are…

Representation Theory · Mathematics 2019-03-12 Sefi Ladkani

We consider a natural generalisation of symmetric Nakayama algebras, namely, symmetric special biserial algebras with at most one non-uniserial indecomposable projective module. We describe the basic algebras explicitly by quiver and…

Representation Theory · Mathematics 2013-10-14 Nicole Snashall , Rachel Taillefer

This article is devoted to introduce a new notion of periodicity shadow, which appeared naturally in the study of combinatorics of tame symmetric algebras of period four, or more generally, algebras of generalized quaternion type. For any…

Representation Theory · Mathematics 2024-11-27 Adam Skowyrski

We define algebras of quasi-quaternion type, which are symmetric algebras of tame representation type whose stable module category has certain structure similar to that of the algebras of quaternion type introduced by Erdmann. We observe…

Representation Theory · Mathematics 2014-04-29 Sefi Ladkani

We give a characterisation of representation-finite symmetric algebras of period four, and describe their basic algebras. In particular, if such an algebra is indecomposable, it has at most two simple modules.

Representation Theory · Mathematics 2026-03-24 Karin Erdmann

A finite-dimensional algebra $A$ over an algebraically closed field $K$ is called periodic if it is periodic under the action of the syzygy operator in the category of $A-A-$ bimodules. The periodic algebras are self-injective and occur…

Representation Theory · Mathematics 2017-10-31 Karin Erdmann , Andrzej Skowroński

We classify tame block algebras of Hecke algebras of classical type over an algebraically closed field of odd characteristic.

Representation Theory · Mathematics 2023-06-22 Susumu Ariki

We introduce a new class of symmetric algebras, which we call hybrid algebras. This class contains on one extreme Brauer graph algebras, and on the other extreme general weighted surface algebras. We show that hybrid algebras are precisely…

Representation Theory · Mathematics 2024-01-09 Karin Erdmann , Andrzej Skowroński

We provide a complete classification of all tame and wild symmetric special multiserial algebras in terms of the underlying Brauer configuration. Our classification contains the symmetric special multiserial algebras of finite…

Representation Theory · Mathematics 2018-04-20 Drew Duffield

The weighted triangulation algebras associated to triangulation quivers and their socle deformations were recently introduced and studied in [15]-[20] and [2]. These algebras, based on surface triangulations and originated from the theory…

Representation Theory · Mathematics 2025-10-22 Andrzej Skowroński , Adam Skowyrski
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