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The (a, b)-KA Indices of Polycyclic Aromatic Hydrocarbons and Benzenoid Systems

A chemical graph is a graph such that vertices correspond to the atoms and the edges to the bonds. The graph indices are applied to measure the chemical characteristics of compounds in Chemical Graph Theory. In this paper, we introduce the first and second (a, b)-KA indices of a chemical graph. Furthermore, we study the mathematical properties of these indices for polycyclic aromatic hydrocarbons and benzenoid systems.