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5-regular oriented graphs with optimum skew energy

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  • Guo, Lifeng
  • Wang, Ligong
  • Xiao, Peng

Abstract

Let G be a simple undirected graph and Gσ be the corresponding oriented graph of G with the orientation σ. The skew energy of Gσ, denoted by εs(Gσ), is defined as the sum of the singular values of the skew adjacency matrix S(Gσ). In 2010, Adiga et al. certified that ɛs(Gσ)≤nΔ, where Δ is the maximum degree of G of order n. It has been shown that every 5-regular oriented graph with optimum skew energy has even neighborhood property, that is each pair of neighborhoods of a graph have even number of common vertices. In this paper, we characterize all connected 5-regular graphs of order n with this property. Moreover, we determine all connected 5-regular oriented graphs of order n with maximum skew-energy.

Suggested Citation

  • Guo, Lifeng & Wang, Ligong & Xiao, Peng, 2017. "5-regular oriented graphs with optimum skew energy," Applied Mathematics and Computation, Elsevier, vol. 301(C), pages 43-59.
    • Handle: RePEc:eee:apmaco:v:301:y:2017:i:c:p:43-59
    DOI: 10.1016/j.amc.2016.12.014
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