New lower bounds for the second variable Zagreb index

被引:4
|
作者
Martinez-Perez, Alvaro [1 ]
Rodriguez, Jose M. [2 ]
机构
[1] Fac CC Soc Talavera, Avda Real Fabr Seda,S-N, Toledo 45600, Spain
[2] Univ Carlos III Madrid, Dept Matemat, AveUniv 30, Madrid 28911, Spain
关键词
Second variable Zagreb index; Graph invariant; Vertex-degree-based graph invariant; Topological index; GEOMETRIC-ARITHMETIC INDEX; 1ST; 3; SMALLEST; TOPOLOGICAL INDEXES; BOILING POINTS; GRAPH; HYDROCARBONS;
D O I
10.1007/s10878-018-0293-7
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
The aim of this paper is to obtain new sharp inequalities for a large family of topological indices, including the second variable Zagreb index , and to characterize the set of extremal graphs with respect to them. Our main results provide lower bounds on this family of topological indices involving just the minimum and the maximum degree of the graph. These inequalities are new even for the RandiAc, the second Zagreb and the modified Zagreb indices.
引用
收藏
页码:194 / 210
页数:17
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