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arXiv · 2610.07999

On the number of cokernel-closed additive subcategories for uniformly oriented $A_n$ quivers

Volodymyr Mazorchuk·Shuoyang Xu
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Abstract

We study the integer sequence that enumerates cokernel-closed, idempotent split, full, additive subcategories of the category of finite dimensional complex representations of a uniformly oriented $A_n$ quiver. Using a combinatorial model, we describe a non-obvious connection of this sequence to Catalan numbers and derive an implicit recurrence. We also describe some basic properties of the lattice underlying the sequences, in particular, we give an explicit description of the meet irreducible elements of that lattice.

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Volodymyr Mazorchuk, Shuoyang Xu. 2026-10-06. On the number of cokernel-closed additive subcategories for uniformly oriented $A_n$ quivers. https://arxiv.org/abs/2610.07999

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