树状六角系统的一些基于顶点度的拓扑指数
Some vertex-degree-based topological indices of catacondensed hexagonal systems

根据图的基于顶点度的拓扑指数的定义以及树状六角系统的结构特征，给出了树状六角系统基于顶点度的一些拓扑指数I(Ch)和该六角系统的转向六角形个数以及分枝六角形个数的函数关系式，并得到了相应的极图.
Based on the definition of the vertex-degree-based topological indices of a graph and the structure of the catacondensed hexagonal systems，we are concerned with the relationship between some vertex-degree-based topological indices of catacondensed hexagonal systems I(Ch) and the number of turned hexagons and branched hexagons. We give a recursion formula to calculate I(Ch) and characterize the corresponding extreme graphs