单项式曲线的强健简并复合体

Pub Date : 2024-07-09 DOI:10.1007/s10801-024-01349-4
Dimitra Kosta, Apostolos Thoma, Marius Vladoiu
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引用次数: 0

摘要

对于每一个简单环理想 \(I_T\) ,我们都可以联想到强稳健简单复数 \(\Delta_T\),它决定了所有以 \(I_T\) 作为花束理想的理想的强稳健性质。我们证明,对于 \(\mathbb {A}^{s}\) 中的单项式曲线的简单环形理想,强稳健简单复数 \(\Delta _T\) 要么是 \(\{emptyset \}\) 要么包含恰好一个 0 维面。在 \(\mathbb {A}^{3}\) 中的单项式曲线的情况下,当且仅当环形理想 \(I_T\) 是一个具有两个贝蒂度的完全交集理想时,强健单纯形复数 \(\Delta _T\) 才包含一个 0 维面。最后,我们提供了一种构造来产生无限多的强健理想,它们的花束理想都是单项式曲线的理想,并证明它们都是这样产生的。
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The strongly robust simplicial complex of monomial curves

To every simple toric ideal \(I_T\) one can associate the strongly robust simplicial complex \(\Delta _T\), which determines the strongly robust property for all ideals that have \(I_T\) as their bouquet ideal. We show that for the simple toric ideals of monomial curves in \(\mathbb {A}^{s}\), the strongly robust simplicial complex \(\Delta _T\) is either \(\{\emptyset \}\) or contains exactly one 0-dimensional face. In the case of monomial curves in \(\mathbb {A}^{3}\), the strongly robust simplicial complex \(\Delta _T\) contains one 0-dimensional face if and only if the toric ideal \(I_T\) is a complete intersection ideal with exactly two Betti degrees. Finally, we provide a construction to produce infinitely many strongly robust ideals with bouquet ideal the ideal of a monomial curve and show that they are all produced this way.

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