摘要：Topological index is a number that can be used to characterize the graph of a molecule. Topological indices describe the physical, chemical, and biological properties of a chemical structure. In this paper, we derive the analytical closed formulas of face index of some planar molecular structures such as TUC 4 , TUC 4 C 8 S , TUH C 6 , TUC 4 C 8 R , and armchair TUV C 6 .
