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arXiv · 2610.24551

Unique Factorization of Power Series Rings over Q-UFDs of Dimension at Most 3

Elad Paran
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Abstract

Let $R$ be a Noetherian unique factorization domain containing $\mathbb Q$, with $\dim R\leq3$. We prove that $R[[t]]$ is a unique factorization domain if and only if two conditions hold: every two-generated parameter ideal $q$ in every height-two localization satisfies $\overline{q^2}\subseteq q$, and every height-three localization has depth three. No excellence or completion hypothesis is imposed. The main local result is that $A[[t]]$ is not a UFD whenever $A$ is a local $\mathbb Q$-UFD of dimension at least three and depth two. We also prove that the UFD property of $R[[t]]$ passes to every coefficient localization in dimension at most three, give an all-dimensional criterion when the completions of the maximal localizations satisfy Serre's condition $(S_2)$, and obtain an arbitrary-characteristic criterion for excellent UFDs of dimension at most three.

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Elad Paran. 2026-10-17. Unique Factorization of Power Series Rings over Q-UFDs of Dimension at Most 3. https://arxiv.org/abs/2610.24551

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