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Nordhaus-Guddum type results for the Steiner Gutman index of graphs by Wang, Zhao; Mao, Yaping; Das, Kinkar Chandra; Shang, Yilun is a scholarly article available to read on EtoBox.

What is Nordhaus-Guddum type results for the Steiner Gutman index of graphs about?

Building upon the notion of Gutman index $\operatorname{SGut}(G)$, Mao and Das recently introduced the Steiner Gutman index by incorporating Steiner distance for a connected graph $G$. The \emph{Steiner Gutman $k$-index} $\operatorname{SGut}_k(G)$ of $G$ is defined by $\operatorname{SGut}_k(G)$ $=\sum_{S\subseteq V(G), \ |S|=k}\left(\prod_{v\in S}deg_G(v)\right) d_G(S)$, in which $d_G(S)$ is the Steiner distance of $S$ and $deg_G(v)$ is the degree of $v$ in $G$. In this paper, we derive new sharp upper and lower bounds on $\operatorname{SGut}_k$, and then investigate the Nordhaus-Gaddum-type results for the parameter $\operatorname{SGut}_k$. We obtain sharp upper and lower bounds of $\operatorname{SGut}_k(G)+\operatorname{SGut}_k(\overline{G})$ and $\operatorname{SGut}_k(G)\cdot \operatorname{SGut}_k(\overline{G})$ for a connected graph $G$ of order $n$, $m$ edges and maximum degree $\Delta$, minimum degree $\delta$.

Author

Wang, Zhao; Mao, Yaping; Das, Kinkar Chandra; Shang, Yilun

Published

2021

Language

EN