Trimming five generated Gorenstein ideals

Let (๐‘…,๐”ช,๐•œ) be a regular local ring of dimension 3. Let I be a Gorenstein ideal of R of grade 3. It follows from a result of Buchsbaum and Eisenbud that there is a skew-symmetric matrix of odd size such that I is generated by the sub-maximal pfaffians of this matrix. Let J be the ideal obtained by multiplying some of the pfaffian generators of I by ๐”ช; we say that J is a trimming of I. In a previous work, the first author and A. Hardesty constructed an explicit free resolution of ๐‘…/๐ฝ and computed a DG algebra structure on this resolution. They utilized these products to analyze the Tor algebra of such trimmed ideals. Missing from their result was the case where I is five generated. In this paper we address this case.

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Journal
Communications in Algebra
Published
2025-04-21
DOI
https://doi.org/10.1080/00927872.2025.2478224
Primary Topic
Commutative Algebra and Its Applications
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article
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article

Trimming five generated Gorenstein ideals

W. Frank Moore, Luigi Ferraro
Communications in Algebra
Commutative Algebra and Its Applications
article

Trimming five generated Gorenstein ideals

W. Frank Moore, Luigi Ferraro
article en

Abstract

Let (๐‘…,๐”ช,๐•œ) be a regular local ring of dimension 3. Let I be a Gorenstein ideal of R of grade 3. It follows from a result of Buchsbaum and Eisenbud that there is a skew-symmetric matrix of odd size such that I is generated by the sub-maximal pfaffians of this matrix. Let J be the ideal obtained by multiplying some of the pfaffian generators of I by ๐”ช; we say that J is a trimming of I. In a previous work, the first author and A. Hardesty constructed an explicit free resolution of ๐‘…/๐ฝ and computed a DG algebra structure on this resolution. They utilized these products to analyze the Tor algebra of such trimmed ideals. Missing from their result was the case where I is five generated. In this paper we address this case.

Communications in AlgebraVol. 53(10)
Wake Forest University (US)
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Commutative Algebra and Its Applications
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