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arXiv · 2609.00707

Trace ideals of syzygies

Haydee Lindo·Justin Lyle·Sarasij Maitra
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Abstract

We study the behavior of trace ideals under taking syzygies. In particular, when $R$ is numerical semigroup ring and $I$ is a homogeneous ideal in $R$, we obtain an upper estimate for $\operatorname{tr}_R(Ω^1_R(I))$, and we show this estimate is sharp when $I$ is the conductor ideal $\mathfrak{c}_R$ of $R$. Using this result, we characterize the numerical semigroup rings for which $\operatorname{tr}_R(M) \subseteq \operatorname{tr}_R(Ω^1_R(M))$ holds for every finitely generated $R$-module $M$. In a similar vein, we characterize numerical semigroup rings for which $\operatorname{tr}_R(Ω^1_R(\mathfrak{c}_R))=\mathfrak{c}_R$.

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Haydee Lindo, Justin Lyle, Sarasij Maitra. 2026-09-05. Trace ideals of syzygies. https://arxiv.org/abs/2609.00707

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