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arXiv 0706.3545math.ACmath.CO
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Newton分次Toric环的Cohen-Macaulay性及其计算

Cohen-Macaulayness and computation of Newton graded toric rings

Mathias Schulze, Uli Walther

摘要:

设$H$是由$A$生成的$\mathbb{Z}^d$中的正半群,$K[H]$是域$K$上的相伴半群环.研究了从$K[H]$到它的$A$ -Newton分次环和它的面环的Cohen-Macaulay性质的遗传.我们的例子表明,没有一个继承一般的Cohen-Macaulay属性。在积极的一面,我们表明,对于每一个$H$存在生成集$A$的牛顿分级保持Cohen-Macaulayness。这给出了关于$A$ -超几何Euler-Koszul同调的一个重要消没结果的初等证明.作为一种工具,我们的调查,我们开发了一个算法来计算算法上的复曲面环上的牛顿过滤。

英文摘要:

Let $H$ be a positive semigroup in $\mathbb{Z}^d$ generated by $A$, and let $K[H]$ be the associated semigroup ring over a field $K$. We investigate heredity of the Cohen-Macaulay property from $K[H]$ to both its $A$-Newton graded ring and to its face rings. We show by example that neither one inherits in general the Cohen-Macaulay property. On the positive side we show that for every $H$ there exist generating sets $A$ for which the Newton graduation preserves Cohen-Macaulayness. This gives an elementary proof for an important vanishing result on $A$-hypergeometric Euler-Koszul homology. As a tool for our investigations we develop an algorithm to compute algorithmically the Newton filtration on a toric ring.

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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