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arXiv 2402.08833math.ACmath.CO
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符号幂:Simis 理想与加权单项式理想

Symbolic powers: Simis and weighted monomial ideals

Fernando O. Méndez, Maria Vaz Pinto, Rafael H. Villarreal

AI总结:

本文利用交换代数与组合学比较单项式理想的符号幂与普通幂,研究 Simis 理想和加权单项式理想,并给出加权有向图边理想对偶在次数 2 上为 Simis 的组合分类。

摘要:

本工作的目的是利用交换代数与组合学比较单项式理想的符号幂与普通幂。符号幂与普通幂相等的单项式理想称为 Simis 理想。加权单项式理想通过对单项式赋予线性权重来定义。我们研究 Simis 理想与正规无挠理想,联系单项式理想和加权单项式理想的若干性质,并给出 $d$-一致 clutters 的边理想的一个结构定理,其中这些边理想的覆盖理想在次数 $d$ 上是 Simis 的。我们的主要结果之一是对加权有向图的边理想的对偶何时在次数 $2$ 上是 Simis 的组合分类。

英文摘要:

The aim of this work is to compare symbolic and ordinary powers of monomial ideals using commutative algebra and combinatorics. Monomial ideals whose symbolic and ordinary powers coincide are called Simis ideals. Weighted monomial ideals are defined by assigning linear weights to monomials. We examine Simis and normally torsion-free ideals, relate some of the properties of monomial ideals and weighted monomial ideals, and present a structure theorem for edge ideals of $d$-uniform clutters whose ideal of covers is Simis in degree $d$. One of our main results is a combinatorial classification of when the dual of the edge ideal of a weighted oriented graph is Simis in degree $2$.

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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