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(Strong) Proper vertex connection of some digraphs

Author

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  • Nie, Kairui
  • Ma, Yingbin
  • Sidorowicz, Elżbieta

Abstract

The (strong) proper vertex connection number spvc→(Γ), (s)pvc-number for short, is denoted as the smallest cardinality of colors required to color the digraph Γ so that Γ is (strong) properly vertex connected. The pvc-number and the spvc-number are calculated for some unique classes of digraphs in this paper, along with some fundamental results on these parameters. It is known that the pvc-number is not exceeding 3 for any strong digraph. For digraphs with pvc-number not exceeding 2, we provide some sufficient conditions. Furthermore, we prove that the spvc-number is at most 3 for any minimal strongly connected digraph, but it can be arbitrarily large for some strong digraphs.

Suggested Citation

  • Nie, Kairui & Ma, Yingbin & Sidorowicz, Elżbieta, 2023. "(Strong) Proper vertex connection of some digraphs," Applied Mathematics and Computation, Elsevier, vol. 458(C).
    • Handle: RePEc:eee:apmaco:v:458:y:2023:i:c:s0096300323004125
    DOI: 10.1016/j.amc.2023.128243
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    References listed on IDEAS

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    1. Fiedorowicz, Anna & Sidorowicz, Elżbieta & Sopena, Éric, 2021. "Proper connection and proper-walk connection of digraphs," Applied Mathematics and Computation, Elsevier, vol. 410(C).
    2. Hui Lei & Shasha Li & Henry Liu & Yongtang Shi, 2018. "Rainbow vertex connection of digraphs," Journal of Combinatorial Optimization, Springer, vol. 35(1), pages 86-107, January.
    3. Gu, Ran & Deng, Bo & Li, Rui, 2019. "Note on directed proper connection number of a random graph," Applied Mathematics and Computation, Elsevier, vol. 361(C), pages 169-174.
    4. Yingbin Ma & Zaiping Lu, 2017. "Rainbow connection numbers of Cayley graphs," Journal of Combinatorial Optimization, Springer, vol. 34(1), pages 182-193, July.
    5. Ma, Yingbin & Lu, Zaiping, 2017. "Rainbow connection numbers of Cayley digraphs on abelian groups," Applied Mathematics and Computation, Elsevier, vol. 311(C), pages 178-183.
    Full references (including those not matched with items on IDEAS)

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