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arXiv 1803.02017math.ACmath.CO
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基于极化和组合optimization的单项理想的深度和正则性

Depth and regularity of monomial ideals via polarization and combinatorial optimization

Jose Martínez-Bernal, Susan Morey, Rafael H. Villarreal, Carlos E. Vivares

摘要:

在本文中,我们使用极化研究的深度和正则性的一个单项理想$I$,局部在一个变量$x_i$,当我们降低的程度,所有的最高权力出现在$I$的最小生成集的变量$x_i$,并检查的深度和正则性的权力杂波使用组合优化技术。如果$I$是具有最大流最小割性质的非混合杂波的边缘理想,我们证明了$I$的幂具有不增加的深度和不减少的规律性。特别地,非混合二部图的边理想具有非减正则性。我们能够证明,一个强完美图的团杂波覆盖的理想的符号权力有非递增的深度。对于均匀理想杂波的理想覆盖,也有类似的结果。

英文摘要:

In this paper we use polarization to study the behavior of the depth and regularity of a monomial ideal $I$, locally at a variable $x_i$, when we lower the degree of all the highest powers of the variable $x_i$ occurring in the minimal generating set of $I$, and examine the depth and regularity of powers of edge ideals of clutters using combinatorial optimization techniques. If $I$ is the edge ideal of an unmixed clutter with the max-flow min-cut property, we show that the powers of $I$ have non-increasing depth and non-decreasing regularity. In particular edge ideals of unmixed bipartite graphs have non-decreasing regularity. We are able to show that the symbolic powers of the ideal of covers of the clique clutter of a strongly perfect graph have non-increasing depth. A similar result holds for the ideal of covers of a uniform ideal clutter.

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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