The spectral radius of graphs with no K2,t minor

The spectral radius of graphs with no K2,t minor
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DOI:
10.1016/j.laa.2017.06.014
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发表时间:
2017-03
影响因子:
1.1
通讯作者:
V. Nikiforov
V. Nikiforov
中科院分区:
数学3区
文献类型:
--
作者:
V. Nikiforov

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设t≥ 3,G是n阶图,不含K2,t子图.若n> 400 t 6,则谱半径μ(G)满足μ(G)≤ t− 1 2+ n+ t 2− 2 t− 3 4,等式成立当且仅当n <$1(mod t)且G= K 1 <$$> n/t <$K t。当t= 3时,对于任何n> 40000,μ(G)的最大值都被精确地找到。
Let t≥ 3 and G be a graph of order n, with no K 2, t minor. If n> 400 t 6, then the spectral radius μ (G) satisfies μ (G)≤ t− 1 2+ n+ t 2− 2 t− 3 4, with equality if and only if n≡ 1 (mod t) and G= K 1∨⌊ n/t⌋ K t. For t= 3 the maximum μ (G) is found exactly for any n> 40000.