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arXiv 1012.5746math.AC
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边理想的极小约简与核

Minimal Reductions and Cores of Edge Ideals

Louiza Fouli, Susan Morey

摘要:

研究了图的边理想的最小约化,并确定了对这些最小约化的生成元的系数的限制。证明了当$I$不是基本环时,则有$\core{I}\subset \m I$,其中$I$是相应的局部多项式环中的边理想,$\m$是该环的极大理想.我们证明了包含是一个平等的边缘理想的偶数圈与任意数量的晶须。此外,我们表明,核心是作为一个有限的交集均匀的最小减少的情况下,甚至周期。核心的公式一般不适用于任何图的边理想,我们提供了一个反例。特别是,我们在这个例子中表明,核心不是作为一般的最小约简的有限交集而获得的。

英文摘要:

We study minimal reductions of edge ideals of graphs and determine restrictions on the coefficients of the generators of these minimal reductions. We prove that when $I$ is not basic, then $\core{I}\subset \m I$, where $I$ is an edge ideal in the corresponding localized polynomial ring and $\m$ is the maximal ideal of this ring. We show that the inclusion is an equality for the edge ideal of an even cycle with an arbitrary number of whiskers. Moreover, we show that the core is obtained as a finite intersection of homogeneous minimal reductions in the case of even cycles. The formula for the core does not hold in general for the edge ideal of any graph and we provide a counterexample. In particular, we show in this example that the core is not obtained as a finite intersection of general minimal reductions.

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