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Furtula, Boris; Gutman, Ivan
Journal of mathematical chemistry, 04/2015, Letnik: 53, Številka: 4Journal Article
In 1972, within a study of the structure-dependency of total π -electron energy ( E ), it was shown that E depends on the sum of squares of the vertex degrees of the molecular graph (later named first Zagreb index), and thus provides a measure of the branching of the carbon-atom skeleton. In the same paper, also the sum of cubes of degrees of vertices of the molecular graph was shown to influence E , but this topological index was never again investigated and was left to oblivion. We now establish a few basic properties of this “forgotten topological index” and show that it can significantly enhance the physico-chemical applicability of the first Zagreb index.
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