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arXiv · 1206.4415

Retractions and Gorenstein homological properties

Xiao-Wu Chen·Yu Ye
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Abstract

We associate to a localizable module a left retraction of algebras; it is a homological ring epimorphism that preserves singularity categories. We study the behavior of left retractions with respect to Gorenstein homological properties (for example, being Gorenstein algebras or CM-free). We apply the results to Nakayama algebras. It turns out that for a connected Nakayama algebra $A$, there exists a connected self-injective Nakayama algebra $A'$ such that there is a sequence of left retractions linking $A$ to $A'$; in particular, the singularity category of $A$ is triangle equivalent to the stable category of $A'$. We classify connected Nakayama algebras with at most three simple modules according to Gorenstein homological properties.

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Xiao-Wu Chen, Yu Ye. 2012-06-21. Retractions and Gorenstein homological properties. https://arxiv.org/abs/1206.4415

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