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树图和单圈图的调和指标

Harmonic index of tree and unicyclic graphs
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摘要 利用改变图的叶子点数目的变换,得到了关于调和指标的两个引理,证明了固定阶数的树图和单圈图的调和指标的紧的上下界,并给出相应极值的图类。 We obtain two lemmas for harmonic index of graphs through the transforms changing leaf numbers. We further prove the sharp bounds for harmonic index of tree and unicyclic graphs with fixed order. We also present the corresponding extremal graphs.
作者 王晓
出处 《山东科学》 CAS 2016年第1期83-86,共4页 Shandong Science
基金 陕西省教育厅自然科学专项基金(12JK0889) 商洛学院科研基金(12SKY011 14SKY003)
关键词 调和指标 树图 单圈图 harmonic index tree graphs unicyclic graphs
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参考文献9

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二级参考文献7

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