Karin Erdmann

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math.RT2024

Local structure of tame symmetric algebras of period four

Karin Erdmann, Adam Hajduk, 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.…

math.RT2024

The Representation Type of the Descent Algebras of Type $A$

Karin Erdmann, Kay Jin Lim

We classify the representation type of the descent algebras of type $\A$ in the positive characteristic case. The algebras have finite representation type only for a few small degr…

math.RT2023

Selfextensions of modules over group algebras

Bernhard Böhmler, Karin Erdmann, Viktória Klász +1

Let $K G$ be a group algebra with $G$ a finite group and $K$ a field and $M$ an indecomposable $K G$ -module. We pose the question, whether $E x t_{K G}^{1} (M, M) \neq = 0$ implies that $Ext_…

Local structure of tame symmetric algebras of period four

The Representation Type of the Descent Algebras of Type A

Selfextensions of modules over group algebras

The Representation Type of the Descent Algebras of Type $A$