The Connectivity of a Bipartite Graph and Its Bipartite Complementary Graph

The Connectivity of a Bipartite Graph and Its Bipartite Complementary Graph
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二分图及其二分补图的连通性

DOI:
10.1142/s0129626420400058
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发表时间:
2019-09
影响因子:
0.4
通讯作者:
Liyun Wu
Liyun Wu
中科院分区:
--
文献类型:
--
作者:
Yingzhi Tian;Huaping Ma;Liyun Wu

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1956年,Nordhaus和Gaddum根据图的阶,给出了图的色数与补的和与积的下界和上界。此后,图[公式:见文]中的一个不变量与[公式:见文]的补[公式:见文]中的同一个不变量的和和/或积的任何界称为诺德豪斯-加德姆型不等式或关系。关于连通性的Nordhaus-Gaddum型不等式已经被一些作者研究过。对于具有双分([公式:见文])的二部图[公式:见文],其二部互补图[公式:见文]是具有[公式:见文]、[公式:见文]和[公式:见文]的二部图。本文得到了二部图及其二部补图的连通性的Nordhaus-Gaddum型不等式。进一步,我们证明了这些不等式是最佳可能的。
In 1956, Nordhaus and Gaddum gave lower and upper bounds on the sum and the product of the chromatic number of a graph and its complement, in terms of the order of the graph. Since then, any bound on the sum and/or the product of an invariant in a graph [Formula: see text] and the same invariant in the complement [Formula: see text] of [Formula: see text] is called a Nordhaus-Gaddum type inequality or relation. The Nordhaus-Gaddum type inequalities for connectivity have been studied by several authors. For a bipartite graph [Formula: see text] with bipartition ([Formula: see text]), its bipartite complementary graph [Formula: see text] is a bipartite graph with [Formula: see text] and [Formula: see text] and [Formula: see text]. In this paper, we obtain the Nordhaus-Gaddum type inequalities for connectivity of bipartite graphs and its bipartite complementary graphs. Furthermore, we prove that these inequalities are best possible.
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