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Let H(n; q, n1, n2, n3, n4) be a unicyclic graph with n vertices containing a cycle Cq and four hanging paths Ph1+1, Pn2+1, Pn3+1 and Pn4+1 attached at the same vertex of the cycle. In this paper, it is proved that all unicyclic graphs H (n; q, n1, n2, n3, n4) are determined by their Laplacian spectra. 相似文献
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设图H(p,tK_(1,m))是一个顶点数为p+mt的连通单圈图,它是由圈C_p的依次相邻的t(1≤t≤p)个顶点、每一个顶点分别与星K_(1,m)的中心重合而得到的单圈图.证明了单圈图H(p,pK_(1,4)),H(p,pK_(1,3)),H(p,(p-1)K_(1,3))是由它们的Laplacian谱确定的,并证明了当p为偶数时,单圈图H(p,2K_(1,3)),H(p,(p-2)K_(1,3)),H(p,(p-3)K_(1,3))也是由它们的Laplacian谱确定的. 相似文献
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