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Abstract

The neighborhood graph \(G'\) of a graph G has the same vertex set as G and two vertices are adjacent in \(G'\) if and only if they have a common neighbor in G. We study the diameter \(\mathrm{diam}(G')\) of the neighborhood graph \(G'\) in terms of the diameter of G. We show that if G is a connected non-bipartite graph of diameter d, then \(\lceil d/2 \rceil \le \mathrm{diam}(G') \le d\) and the bounds are best possible for every \(d \ge 1\). If G is a connected bipartite graph, then \(G'\) has 2 components. We also present results on the diameter of components of \(G'\), if \(G'\) is the neighborhood graph of a connected bipartite graph.

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Acknowledgments

The work was supported by the National Research Foundation of South Africa; Grant numbers: 91499, 90793.

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Correspondence to Tomáš Vetrík.

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Communicated by Xueliang Li.

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Vetrík, T. Diameter of Neighborhood Graphs. Bull. Malays. Math. Sci. Soc. 39 (Suppl 1), 117–122 (2016). https://doi.org/10.1007/s40840-015-0231-0

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  • DOI: https://doi.org/10.1007/s40840-015-0231-0

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