On the existence of curves with prescribed a-number

期刊： ARKIV FOR MATEMATIK, 2021; 59 (1)

We study the existence of Artin-Schreier curves with large a-number. We show that Artin-Schreier curves with large a-number can be written in certain ......

Local and 2-local automorphisms of simple generalized Witt algebras

期刊： ARKIV FOR MATEMATIK, 2021; 59 (1)

In this paper, we prove that every invertible 2-local or local automorphism of a simple generalized Witt algebra over any field of characteristic 0 is......

Spectral asymptotics of Laplacians related to one-dimensional graph-directed self-similar measures with overlaps

期刊： ARKIV FOR MATEMATIK, 2020; 58 (2)

For the class of graph-directed self-similar measures on R, which could have overlaps but are essentially of finite type, we set up a framework for de......

A reverse quasiconformal composition problem for Q(alpha)(R-n)

期刊： ARKIV FOR MATEMATIK, 2019; 57 (2)

We give a partial converse to [8, Theorem 1.3] (as a resolution of [2, Problem 8.4] for the quasiconformal Q-composition) for Q(0<2-1) (R-n >= 2......

JIF：0.58

Injective objects in the category of finitely presented representations of an interval finite quiver

期刊： ARKIV FOR MATEMATIK, 2019; 57 (2)

We characterize the indecomposable injective objects in the category of finitely presented representations of an interval finite quiver.

JIF：0.58

The Auslander bijections and universal extensions

期刊： ARKIV FOR MATEMATIK, 2017; 55 (1)

Universal extensions arise naturally in the Auslander bijections. For an abelian category having Auslander-Reiten duality, we exploit a bijection tria......

JIF：0.65