A conjecture on the diameter and signless Laplacian index of graphs
A conjecture on the diameter and signless Laplacian index of graphs
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关于图的直径和无符号拉普拉斯指数的猜想
DOI:
10.1016/j.laa.2014.03.005
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发表时间:
2014-06
影响因子:
1.1
通讯作者:
Mei Lu
中科院分区:
文献类型:
--
作者:
Huiqing Liu;Mei Lu
A bug Bug p, q 1, q 2 is a graph obtained from a complete graph K p by deleting an edge uv and attaching paths P q 1 and P q 2 at u and v, respectively. In this paper, we show that for connected graphs G of order n with signless Laplacian index q 1 (G) and diameter diam (G), q 1 (G)⋅ diam (G) is maximized for and only for the graph Bug⌊ n/2⌋+ 2, p, q, where p=⌊ d/2⌋, q=⌈ d/2⌉ and d=⌊(n+ 1)/2⌋. This solves a conjecture in [6] on the signless Laplacian index involving the diameter.
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