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arXiv 2604.20189math.AC
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单项曲线的Castelnuovo-Mumford正则度的新的界及其在和集中的应用

New bounds on Castelnuovo--Mumford regularity of monomial curves and application to sumsets

Le Tuan Hoa, Doan Quang Tien

AI总结:

本文在特定条件下给出了单项曲线正则度的更优界,通过研究Apery集和Frobenius数,提出新的判别准则,并提供算法用于检查Cohen-Macaulay和Buchsbaum性质,同时应用于和集结构研究。

摘要:

本文在特定条件下给出了单项曲线正则度的更优界,通过研究Apery集和Frobenius数,提出新的判别准则,并提供算法用于检查Cohen-Macaulay和Buchsbaum性质,同时应用于和集结构研究。

英文摘要:

A monomial curve $C$ is defined by a sequence of coprime integers $0 = a_0 < a_1 < \cdots < a_k =: d$. One gap of this sequence is $a_{i+1} - a_i - 1$. Gruson--Lazarsfeld--Peskine bound (1983) says that $reg (C) \le d - k +2$, which is equal to the sum of all gaps plus 2. Lvovsky (1996) showed that it is enough to take the sum of two largest gaps plus 2. In this paper, under some specific conditions, we give several new bounds which are better than Lvovsky's bound. Our method relies on the study of Apery sets and Frobenius numbers. From this we can give new criteria to check the (arithmetically) Cohen--Macaulay and Buchsbaum property of $C$. Algorithms are provided to check these properties as well as to compute $ reg(C)$ and other invariants. We also give an application to study the structure of sumsets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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