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The document summarizes research on topological indices called the harmonic index H, sum-connectivity index X, hyper-Zagreb index χ2, and general sum-connectivity index χα. It outlines extremal results and bounds involving these indices, which measure properties of molecular graphs and have applications in chemistry. The indices are defined based on vertex degrees and can be considered as special cases of the general bond incident degree index. The document reviews key findings on determining graph structur

Author

Balachandran

Language

EN