a note on the first geometric-arithmetic index of hexagonal systems and phenylenes
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the first geometric-arithmetic index was introduced in the chemical theory as the summationof 2 du dv /(du dv ) overall edges of the graph, where du stand for the degree of the vertexu. in this paper we give the expressions for computing the first geometric-arithmetic index ofhexagonal systems and phenylenes and present new method for describing hexagonal systemby corresponding a simple graph to each hexagonal system.
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Journal title:
iranian journal of mathematical chemistryPublisher: university of kashan
ISSN 2228-6489
volume 2
issue 2 2011
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