k-分支星状树的第二几何算术指标 |
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引用本文: | 詹福琴,乔友付. k-分支星状树的第二几何算术指标[J]. 数学的实践与认识, 2014, 0(7) |
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作者姓名: | 詹福琴 乔友付 |
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作者单位: | 河池学院数学系; |
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基金项目: | 国家自然科学基金(10761008);广西自然科学基金项目(2013GXNSFBA019022);广西教育厅科研项目(201010LX471);河池学院重点科研项目(2011YBZ-N003;2012YBZ-N004) |
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摘 要: | ![]() 数学化学中,第二几何算术指标是新近提出的一个图的拓扑指标,它与Szeged指标和点PI指标具有紧密关系.如果树的一个顶点υ的度大于等于3,则称顶点υ是其一个分支点.通过树的第二几何算术指标的一个增加或减少的变换,刻画了k-分支星状树的第二几何算术指标的最值,同时确定了相应的极图.
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关 键 词: | 几何算术指标 szeged指标 PI指标 星状树 |
The Second Geometric-Arithmetic Index of the Starlike Tree with k-component |
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Abstract: | ![]() The second geometric-arithmetic index is a newly proposed topological indices in mathematical chemistry.It is closely related to the Szeged index and vertex PI index.A vertex v is said to be a branching point of a tree if d(v) ≥ 3.In this paper,the maximum(resp.minimum) the second geometric-arithmetic index of the starlike tree with κ-component are charactered in terms of an increasing or decreasing transformation of the second geometricarithmetic index of trees,and the corresponding extremal trees are also determined. |
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Keywords: | geometric-arithmetic index Szeged index PI index starlike tree |
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