Inverse Sum Indeg Coindex of Graphs

K. Pattabiraman


The inverse sum indeg coindex
$\overline{ISI}(G)$ of a simple connected graph $G$ is defined as the
sum of the terms $\frac{d_G(u)d_G(v)}{d_G(u)+d_G(v)}$ over all edges $uv$ not in $G,$ where $d_G(u)$
denotes the degree of a vertex $u$ of $G.$ In this paper, we present the upper
bounds on inverse sum indeg coindex of edge corona product graph and Mycielskian graph. In addition,
we obtain the exact value of both inverse sum indeg index and its coindex of a double graph.


Inverse sum indeg index, edge corona graph, Mycielskian graph, double graph

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