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arXiv 1607.07082cs.DM
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关于边容量限制的Steiner树问题

On the edge capacitated Steiner tree problem

Cedric Bentz, Marie-Christine Costa, Alain Hertz

摘要:

给定一个图G =(V,E),其根r在V中,正容量{c(e)|e in E}和非负长度{l(e)|e in E},最小长度(有根)边约束Steiner树问题是在G中寻找一棵树,它的总长度最小,以r为根,跨越给定的顶点子集T,并且使得对于E中的每个e,至多有c(e)条路将r连接到T中的顶点,并且包含e。我们研究了问题的复杂性和可逼近性,考虑了几个相关的参数,如终端的数量,边的长度和最小和最大的边缘容量。对于所有,但一个组合的假设,这些参数,我们解决的问题,给出一个完整的表征,分离出听话的情况下,从硬的。唯一剩下的开放的情况下被证明是等价于一个长期存在的开放问题。我们还证明了我们的问题和经典的Steiner树以及顶点不相交的道路问题之间的密切关系。

英文摘要:

Given a graph G = (V,E) with a root r in V, positive capacities {c(e)|e in E}, and non-negative lengths {l(e)|e in E}, the minimum-length (rooted) edge capacitated Steiner tree problem is to find a tree in G of minimum total length, rooted at r, spanning a given subset T of vertices, and such that, for each e in E, there are at most c(e) paths, linking r to vertices in T, that contain e. We study the complexity and approximability of the problem, considering several relevant parameters such as the number of terminals, the edge lengths and the minimum and maximum edge capacities. For all but one combinations of assumptions regarding these parameters, we settle the question, giving a complete characterization that separates tractable cases from hard ones. The only remaining open case is proved to be equivalent to a long-standing open problem. We also prove close relations between our problem and classical Steiner tree as well as vertex-disjoint paths problems.

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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