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On Relation Between Kirchhoff Index, Laplacian-Energy-Like Invariant and Laplacian Energy of Graphs

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Abstract

Let \(G=(V,E)\) be a simple graph of order n with m edges and Laplacian eigenvalues \(\mu _1\ge \mu _2\ge \cdots \ge \mu _{n-1}\ge \mu _n=0\). The Kirchhoff index and the Laplacian-energy-like invariant of G are defined as

$$\begin{aligned} \mathrm{Kf}(G)=n\sum _{k=1}^{n-1}\frac{1}{\mu _k}~~ \text{ and } ~~\mathrm{LEL}(G)=\sum _{k=1}^{n-1}\sqrt{\mu _k}, \end{aligned}$$

respectively. The Laplacian energy of the graph G is defined as

$$\begin{aligned} \mathrm{LE}(G)=\sum ^n_{i=1}\Big |\mu _i-\frac{2m}{n}\Big |. \end{aligned}$$

In this paper, we present an upper bound on Kf of graphs. Also, we obtain some relations between Kf, LEL and first Zagreb index of G. Finally, we give a relation between LEL and LE of G.

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Acknowledgments

The authors are much grateful to two anonymous referees for their careful reading and valuable comments on our paper, which have considerably improved the presentation of this paper.

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Correspondence to Kinkar Ch. Das.

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Communicated by Xueliang Li.

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Das, K.C., Xu, K. On Relation Between Kirchhoff Index, Laplacian-Energy-Like Invariant and Laplacian Energy of Graphs. Bull. Malays. Math. Sci. Soc. 39 (Suppl 1), 59–75 (2016). https://doi.org/10.1007/s40840-015-0280-4

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  • DOI: https://doi.org/10.1007/s40840-015-0280-4

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