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On the p-median polytope and the directed odd cycle inequalities: Triangle-free oriented graphs

机译:关于p中位数多位点和有向奇数周期不等式:无三角形定向图

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We study the effect of the odd directed cycle inequalities in the description of the polytope associated with the p-median problem. We treat oriented graphs, i.e., if (u,v) is in the arc-set, then (v, u) is not in the arc-set. We characterize the oriented graphs for which the obvious linear relaxation together with the directed odd cycle inequalities describe the p-median polytope. This study has two parts: in this paper we treat triangle-free graphs, then in a second paper we use induction on the number of triangles to treat general oriented graphs. (C) 2015 Elsevier B.V. All rights reserved.
机译:我们在与p中位数问题相关的多表位的描述中研究了奇数有向循环不等式的影响。我们对待定向图,即如果(u,v)在弧集中,则(v,u)不在弧集中。我们表征了定向图,其中明显的线性弛豫以及有向奇数周期不等式描述了p中位数多态性。这项研究分为两个部分:在本文中,我们处理无三角图,然后在第二篇文章中,对三角形的数量使用归纳法来处理一般的有向图。 (C)2015 Elsevier B.V.保留所有权利。

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