arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2512.08554cs.DM
收藏

弦图的导出树与导出路径多面体的扩展形式

Extended formulations for induced tree and path polytopes of chordal graphs

IRISA CNRS UMR 6074, Université de Rennes(雷恩大学);LIX – CNRS UMR 7161, Institut polytechnique de Paris(巴黎理工学院)

Alexandre Dupont-Bouillard

AI总结:

本文通过证明弦图的导出树和导出路径扩展关联向量构成Hilbert基,给出了弦图导出树和导出路径多面体的两个扩展空间形式,并证明了这两个多面体具有整数分解性质。

摘要:

在本文中,我们分别给出了弦图的导出树和导出路径多面体在顶点和边变量下的两个扩展空间形式。这些形式是通过证明弦图的导出树和导出路径扩展关联向量构成Hilbert基而得到的。这也表明这两个多面体在弦图中具有整数分解性质。虽然导出树多面体的形式很容易看出具有紧凑的规模,但我们为导出路径多面体提供的系统具有指数数量的不等式。我们展示了这些不等式中哪些定义了面,并给出了一个可以在多项式时间内枚举的面定义超集。我们表明,对于某些图,后一个超集包含冗余不等式。作为推论,我们得到在弦图类中,寻找最大化边和顶点线性函数的导出树或路径的问题可以在多项式时间内解决。

英文摘要:

In this article, we give two extended space formulations, respectively, for the induced tree and path polytopes of chordal graphs with vertex and edge variables. These formulations are obtained by proving that the induced tree and path extended incidence vectors of chordal graphs form Hilbert basis. This also shows that both polytopes have the integer decomposition property in chordal graphs. Whereas the formulation for the induced tree polytope is easily seen to have a compact size, the system we provide for the induced path polytope has an exponential number of inequalities. We show which of these inequalities define facets and exhibit a superset of the facet-defining ones that can be enumerated in polynomial time. We show that for some graphs, the latter superset contains redundant inequalities. As corollaries, we obtain that the problems of finding an induced tree or path maximizing a linear function over the edges and vertices are solvable in polynomial time for the class of chordal graphs.

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。

↑