University of KashanIranian Journal of Mathematical Chemistry2228-64892220111201A Note on the First Geometric-Arithmetic Index of Hexagonal Systems and Phenylenes101108521710.22052/ijmc.2011.5217ENZ.YARAHMADIKhorramabad Branch, Islamic Azad University,
I. R. IranJournal Article20140429The first geometric-arithmetic index was introduced in the chemical theory as the summation of 2 du dv /(du dv ) overall edges of the graph, where du stand for the degree of the vertex u. In this paper we give the expressions for computing the first geometric-arithmetic index of hexagonal systems and phenylenes and present new method for describing hexagonal system by corresponding a simple graph to each hexagonal system.http://ijmc.kashanu.ac.ir/article_5217_cf559f5adb428efd20c49b760ad4806e.pdf