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Multi-Rees Algebras of Strongly Stable Ideals

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arxiv 2012.15447 v2 pith:S5MJDKKW submitted 2020-12-31 math.AC math.CO

Multi-Rees Algebras of Strongly Stable Ideals

classification math.AC math.CO
keywords oplusbasisidealsmathcalmulti-reesobnerstablestrongly
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We prove that the multi-Rees algebra $\mathcal{R}(I_1 \oplus \cdots \oplus I_r)$ of a collection of strongly stable ideals $I_1, \ldots, I_r$ is of fiber type. In particular, we provide a Gr\"obner basis for its defining ideal as a union of a Gr\"obner basis for its special fiber and binomial syzygies. We also study the Koszulness of $\mathcal{R}(I_1 \oplus \cdots \oplus I_r)$ based on parameters associated to the collection. Furthermore, we establish a quadratic Gr\"obner basis of the defining ideal of $\mathcal{R}(I_1 \oplus I_2)$ where each of the strongly stable ideals has two quadric Borel generators. As a consequence, we conclude that this multi-Rees algebra is Koszul.

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