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arXiv · 1801.05979

On Krull-Gabriel dimension and Galois coverings

Grzegorz Pastuszak
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Abstract

Assume that $K$ is an algebraically closed field, $R$ a locally support-finite locally bounded $K$-category, $G$ a torsion-free admissible group of $K$-linear automorphisms of $R$ and $A=R/G$. We show that the Krull-Gabriel dimension $KG(R)$ of $R$ is finite if and only if the Krull-Gabriel dimension $KG(A)$ of $A$ is finite. In these cases $KG(R)=KG(A)$. We apply this result to determine the Krull-Gabriel dimension of standard selfinjective algebras of polynomial growth. Finally, we show that there are no super-decomposable pure-injective modules over standard selfinjective algebras of domestic type.

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Grzegorz Pastuszak. 2018-01-18. On Krull-Gabriel dimension and Galois coverings. https://arxiv.org/abs/1801.05979

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