Study of inverse sum indeg index

Document Type : Note


Departmnet of Mathematics, SRTT University


Let $MG(i,n)$ $(1\leq  i \leq 3)$ denote to the class of all $n$-vertex molecular graphs with minimum degree $ i$.  The  inverse  sum  indeg  index of   a   graph  is   defined   as    $ISI=\sum_{uv\in E(G)}  d_ud_v/(d_u+d_v)$,   where $ d_{u}$ denotes to the degree of vertex $ u$. In this paper, we propose some extremal molecular graphs with the minimum and the maximum value of inverse sum indeg index in $MG(i,n)$.

Graphical Abstract

Study of inverse sum indeg index

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Volume 7, Issue 2
December 2017
Pages 103-109
  • Receive Date: 19 May 2017
  • Revise Date: 03 July 2017
  • Accept Date: 12 August 2017
  • First Publish Date: 01 December 2017