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arXiv · 2502.20994

Resolving subcategories for gentle algebras I: Monogeneous resolving subcategories for gentle trees

Benjamin Dequêne·Michaël Schoonheere
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Abstract

This paper is the first part of a series that intends to study resolving subcategories for gentle algebras over an algebraically closed field $\mathbb{K}$. In a general setting, we improve the precision of Takahashi's algorithm for resolving closure calculations in well-behaved abelian categories. Then, we modify the geometric model of Baur--Coelho-Simões and Opper--Plamondon--Schroll to compute such subcategories for gentle quivers that have a finite global dimension. Finally, we focus on gentle quivers $(Q,R)$ such that $Q$ is a directed tree, and we study monogeneous resolving subcategories, which are the ones generated by a single non-projective indecomposable $\mathbb{K}Q/\langle R \rangle$-module. Moreover, we prove that these subcategories are the join-irreducible elements of the poset of all resolving subcategories ordered by inclusion.

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Benjamin Dequêne, Michaël Schoonheere. 2026-09-09. Resolving subcategories for gentle algebras I: Monogeneous resolving subcategories for gentle trees. https://arxiv.org/abs/2502.20994

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