The price of connectivity for feedback vertex set

The price of connectivity for feedback vertex set
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反馈顶点集的连接价格

DOI:
10.1016/j.dam.2016.08.011
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发表时间:
2017
影响因子:
1.1
通讯作者:
Belmonte R
Belmonte R
中科院分区:
数学3区
文献类型:
--
作者:
Belmonte R

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设fvs(G)和cfvs(G)分别表示图G的最小反馈点集和最小连通反馈点集的基数.一类图G的反馈点集连通度的代价定义为所有连通图G∈ G上的最大比率cfvs(G)/fvs(G).本文研究了由有限个禁止导出子图族H定义的图类的POC-FVS。我们精确地刻画了H-无图的poc-fvs上界为常数的有限族H。此外,对于H = 1的情形,我们精确地确定了那些存在常数c H使得对每个连通的无H图G,cfvs(G)≤ fvs(G)+ c H的图H,以及那些我们可以取c H= 0的图H。
Let fvs (G) and cfvs (G) denote the cardinalities of a minimum feedback vertex set and a minimum connected feedback vertex set of a graph G, respectively. The price of connectivity for feedback vertex set (poc-fvs) for a class of graphs G is defined as the maximum ratio cfvs (G)/fvs (G) over all connected graphs G∈ G. We study the poc-fvs for graph classes defined by a finite family H of forbidden induced subgraphs. We characterize exactly those finite families H for which the poc-fvs for H-free graphs is upper bounded by a constant. Additionally, for the case where∣ H∣= 1, we determine exactly those graphs H for which there exists a constant c H such that cfvs (G)≤ fvs (G)+ c H for every connected H-free graph G, as well as exactly those graphs H for which we can take c H= 0.
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