Solution to a conjecture on a Nordhaus-Gaddum type result for the Kirchhoff index
Solution to a conjecture on a Nordhaus-Gaddum type result for the Kirchhoff index
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基尔霍夫指数的 Nordhaus-Gaddum 型结果猜想的解
DOI:
10.1016/j.amc.2018.03.070
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发表时间:
2018-09
影响因子:
4
通讯作者:
Li Jing
中科院分区:
文献类型:
--
作者:
Yang Yujun;Cao Yuliang;Yao Haiyuan;Li Jing
Let G be a connected graph. The resistance distance between any two vertices of G is defined as the net effective resistance between them if each edge of G is replaced by a unit resistor. The Kirchhoff index of G, denoted by Kf (G), is the sum of resistance distances between all pairs of vertices in G. In [28], it was conjectured that for a connected n-vertex graph G with a connected complement G¯, K f (G)+ K f (G¯)≤ n 3− n 6+ n∑ k= 1 n− 1 1 n− 4 sin 2 k π 2 n, with equality if and only if G or G¯ is the path graph P n. In this paper, by employing combinatorial and electrical techniques, we show that the conjecture is true except for a complementary pair of small graphs on five vertices.
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