K_7-Minors in optimal 1-planar graphs

K_7-Minors in optimal 1-planar graphs
复制标题

最优 1 平面图中的 K_7-Minors

DOI:
10.1016/j.disc.2017.01.022
复制
发表时间:
2017
影响因子:
0.8
通讯作者:
Yusuke Suzuki
Yusuke Suzuki
中科院分区:
数学3区
文献类型:
--
作者:
Nishina Makoto;Suzuki Yusuke;鈴木信行;鈴木信行;Yusuke Suzuki

文献摘要

相似文献

讨论了最优1-平面图中给定图的子式的存在性。作为我们的第一个主要结果,我们证明了对于任何图H,存在一个最优1-平面图,它包含H作为拓扑子式。接下来,我们考虑完全图的子图。从马德尔(马德尔,1968)的结果可以很容易地得到:每个最优1-平面图都有一个K6-子式.本文刻画了不含K7-子式的最优1-平面图.
We discuss the existence of minors of given graphs in optimal 1-planar graphs. As our first main result, we prove that for any graph H, there exists an optimal 1-planar graph which contains H as a topological minor. Next, we consider minors of complete graphs. It is easily obtained from Mader’s result (Mader, 1968) that every optimal 1-planar graph has a K 6-minor. In the paper, we characterize optimal 1-planar graphs having no K 7-minor.