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arXiv 1302.2899math.COmath.AC
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Gorenstein割多面体

Gorenstein cut polytopes

Hidefumi Ohsugi

摘要:

一个整凸多胞体${\mathcal P}$称为Gorenstein,如果它的复曲面环$K[{\mathcal P}]$是正规的且是Gorenstein的.本文给出了图的Gorenstein割多面体的一个明确的刻画。首先,我们证明了Gorenstein割多面体是压缩的(即,其所有的反向字典式三角剖分都是幺模的)。其次,应用Athanasiadis关于Gorenstein压缩多面体的理论,证明了图$G$的割多面体是Gorenstein当且仅当$G$没有$K_5$ -子图,并且$G$是一个没有长度为$\geq 6$的诱导圈的二部图或一个无桥弦图.

英文摘要:

An integral convex polytope ${\mathcal P}$ is said to be Gorenstein if its toric ring $K[{\mathcal P}]$ is normal and Gorenstein. In this paper, Gorenstein cut polytopes of graphs are characterized explicitly. First, we prove that Gorenstein cut polytopes are compressed (i.e., all of whose reverse lexicographic triangulations are unimodular). Second, by applying Athanasiadis's theory for Gorenstein compressed polytopes, we show that a cut polytope of a graph $G$ is Gorenstein if and only if $G$ has no $K_5$-minor and $G$ is either a bipartite graph without induced cycles of length $\geq 6$ or a bridgeless chordal graph.

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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