The zeroth-order Randić index and sum-connectivity index are two indices based on the vertex degrees. They appeared in the topological formula for the total π-electron energy of conjugated molecules and attracted a lot of attention in recent years. Let ...
The inverse sum indeg index is a recently-introduced bond-additive descriptor that was selected by Vukičević and Gašperov (2010) as a significant predictor of total surface area of octane isomers. In this paper, we present several sharp upper and lower ...
The general sum-connectivity index of a graph G is defined as (G)=uvE(G)(d(u)+d(v)), where d(u) denotes the degree of a vertex u in G and is a real number. In this paper, we present the maximum general sum-connectivity indices of trees and chemical ...
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