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摘要: 利用 Perron 向量的概念, 分别刻画出谱半径达到第二大和第三大的 $n$ 阶 2-树. 特别对于 $n=6$, 给出了谱半径依次减小的 5 个 6 阶 2-树.Abstract: By using the concept of Perron vector, this paper characterized the extremal graphs of all 2-trees with $n$ vertices ($n$ fixed) which have the second and the third largest spectral radius, respectively. Particularly, for $n=6$, five 2-trees with 6 vertices were found whose spectral radii are strictly descent.
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Key words:
- 2-treesspectral radiusPerron vector /
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