The Laplacian spectral radius of graphs with given matching number

The Laplacian spectral radius of graphs with given matching number
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DOI:
10.1016/j.laa.2006.09.014
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发表时间:
2007-04
期刊:
Ars Comb.
影响因子:
--
通讯作者:
Lihua Feng
Lihua Feng
中科院分区:
其他
文献类型:
--
作者:
Lihua Feng

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本文证明了在所有匹配个数为β的n阶图中,具有最大谱半径的图是Knif n=2β或2β+1;K2β+1∪Kn-2β-1 if 2β+2⩽n<3β+2;Kβ⋁Kn-β或K2β+1∪Kn-2β-1 if n=3β+2;Kβ⋁Kn-βif n>3β+2,其中Kt是t个顶点上的空图。
In this paper, we show that of all graphs of order n with matching number β, the graphs with maximal spectral radius are Knif n=2β or 2β+1; K2β+1∪Kn-2β-1¯ if 2β+2⩽n<3β+2; Kβ⋁Kn-β¯ or K2β+1∪Kn-2β-1¯ if n=3β+2; Kβ⋁Kn-β¯ if n>3β+2, where Kt¯ is the empty graph on t vertices.