A short note on inverse sum indeg index of graphs

Selvaraj Balachandran, Suresh Elumalai, Toufik Mansour

Research output: Contribution to journalArticlepeer-review


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.

Original languageAmerican English
Article number2050152
JournalAsian-European Journal of Mathematics
Issue number1
StatePublished - Jan 2021


  • Inverse sum indeg index
  • maximum degree
  • minimum degree

All Science Journal Classification (ASJC) codes

  • General Mathematics


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