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New Nordhaus-Gaddum-type results for the Kirchhoff index

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Abstract

Let G be a connected graph. The resistance distance between any two vertices of G is defined as the net effective resistance between them if each edge of G is replaced by a unit resistor. The Kirchhoff index is the sum of resistance distances between all pairs of vertices in G. Zhou and Trinajstić (Chem Phys Lett 455(1–3):120–123, 2008) obtained a Nordhaus-Gaddum-type result for the Kirchhoff index by obtaining lower and upper bounds for the sum of the Kirchhoff index of a graph and its complement. In this paper, by making use of the Cauchy-Schwarz inequality, spectral graph theory and Foster’s formula, we give better lower and upper bounds. In particular, the lower bound turns out to be tight. Furthermore, we establish lower and upper bounds on the product of the Kirchhoff index of a graph and its complement.

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Authors and Affiliations

  1. School of Mathematics and Information Science, Yantai University, 264005, Yantai, Shandong, People’s Republic of China

    Yujun Yang

  2. Mathematical Chemistry Group, Texas A&M University at Galveston, Galveston, TX, 77553-1675, USA

    Yujun Yang & Douglas J. Klein

  3. School of Mathematics and Statistics, Lanzhou University, Lanzhou, Gansu, 730000, People’s Republic of China

    Heping Zhang

Authors
  1. Yujun Yang
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  2. Heping Zhang
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  3. Douglas J. Klein
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Correspondence to Yujun Yang.

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Yang, Y., Zhang, H. & Klein, D.J. New Nordhaus-Gaddum-type results for the Kirchhoff index. J Math Chem 49, 1587–1598 (2011). https://doi.org/10.1007/s10910-011-9845-0

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