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Hitting minors on bounded treewidth graphs. III. Lower bounds
Journal of Computer and System Sciences ( IF 1.1 ) Pub Date : 2019-12-12 , DOI: 10.1016/j.jcss.2019.11.002
Julien Baste , Ignasi Sau , Dimitrios M. Thilikos

For a finite fixed collection of graphs F, the F-M-Deletion problem consists in, given a graph G and an integer k, decide whether there exists SV(G) with |S|k such that GS does not contain any of the graphs in F as a minor. We provide lower bounds under the ETH on the smallest function fF such that F-M-Deletion can be solved in time fF(tw)nO(1) on n-vertex graphs, where tw denotes the treewidth of G. We first prove that for any F containing connected graphs of size at least two, fF(tw)=2Ω(tw), even if G is planar. Our main result is that if F contains a single connected graph H that is either P5 or is not a minor of the banner, then fF(tw)=2Ω(twlogtw).



中文翻译:

在有界树宽图上击中未成年人。三,下界

对于图的有限固定集合 FF-M-Deletion问题在于,给定一个图G和一个整数k,确定是否存在小号VG|小号|ķ 这样 G小号 不包含中的任何图形 F作为未成年人。我们在ETH的最小功能上提供了下限FF 这样 F-M-Deletion可以及时解决FFtwñØ1个n-顶点图上,其中tw表示G的树宽。我们首先证明F 包含大小至少为两个的连通图, FFtw=2Ωtw,即使G是平面的。我们的主要结果是F包含一个单一的连通图ħ要么是P5 或不是未成年人 b一种ññË[R, 然后 FFtw=2Ωtw日志tw

更新日期:2019-12-12
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