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arXiv 2409.07583math.AC
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Koszul同调中的单项式闭链

Monomial Cycles in Koszul Homology

Jacob Zoromski

AI总结:

该研究探讨单项式环上Koszul同调的单项式闭链,提出边缘理想刻画闭链为边缘链的条件,推导Golod单项式理想的判定条件并完成多类Golod理想分类,还证明具线性商的一类理想存在单项式闭链构成的同调基。

摘要:

本文研究单项式环上Koszul同调中的单项式闭链。核心结果表明,单项式闭链是边缘链当且仅当代表该闭链的单项式包含于我们提出的被称为边缘理想的理想中。作为推论,我们得到了单项式理想为Golod理想的必要理想论条件,并依据这些条件对四元变量中的Golod单项式理想进行了分类。我们进一步将这些条件应用于对称单项式理想,实现了对由单个单项式的所有置换生成的Golod理想的分类。最后,我们证明一类具有线性商的理想存在由单项式闭链构成的Koszul同调基,这类理想既包含著名的稳定单项式理想情形,也包含对称移位理想等新情形。

英文摘要:

In this paper we study monomial cycles in Koszul homology over a monomial ring. The main result is that a monomial cycle is a boundary precisely when the monomial representing that cycle is contained in an ideal we introduce called the boundary ideal. As a consequence, we obtain necessary ideal-theoretic conditions for a monomial ideal to be Golod. We classify Golod monomial ideals in four variables in terms of these conditions. We further apply these conditions to symmetric monomial ideals, allowing us to classify Golod ideals generated by the permutations of one monomial. Lastly, we show that a class of ideals with linear quotients admit a basis for Koszul homology consisting of monomial cycles. This class includes the famous case of stable monomial ideals as well as new cases, such as symmetric shifted ideals.

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