The inverse sum indeg index of a graph G is defined as ISI(G) =?uv E(G) d(u)d(v) d(u)+d(v), where d(u) is the degree of the vertex u. In a recent paper, Pattabiraman [Inverse sum indeg index of graphs, AKCE Int. J. Graphs Combinat. 15(2) (2018) 155-167] gave some lower and upper bounds on ISI index of all connected graphs in terms of Harmonic index, second Zagreb index and hyper Zagreb index. But some results were erroneous. In this note, we have corrected these results.
Bibliographical noteFunding Information:
We would like to thank the reviewer for careful and thorough reading of this paper and for the thoughtful comments and constructive suggestions, which help to improve the quality of this paper. The second author’s research is supported by University of Haifa, Israel, for the Postdoctoral studies and it is gratefully acknowledged.
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- Inverse sum indeg index
- maximum degree
- minimum degree
ASJC Scopus subject areas
- Mathematics (all)