Open Access
Research ArticleΒ·pp. 1181β1199Β·Vol. 29, Issue 3Mar 2026
Relationship between the inverse sum indeg index of graph operations and their factors
Nasrin Dehgardi, Mahdieh Azari, Yilun Shang
Published Online: 22 Dec 2025DOI: 10.47974/JDMSC-2193
In this paper: The inverse sum indeg (ISI) index of a simple graph π¦ is expressed byΒ ISI(π¦) = βΟπ¦ Οβπ¦βEπ¦ dπ¦Β (Οπ¦)dπ¦ (Οβπ¦)/dπ¦ (Οπ¦) + dπ¦ (Οβπ¦). Β in which Eπ¦ represents the edge set of the graph π¦ and dπ¦ (Οπ¦) indicat...
