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2-(Edge-)Connected Edge Domination Number and Matching Number

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Abstract

A k-connected (resp. k-edge-connected) edge dominating set D of a connected graph G is a subset of E(G) such that G[D] is k-connected (resp. k-edge-connected) and each \(e\in E(G)\setminus D\) has at least one neighbor in D. The k-connected edge domination number (resp. k-edge-connected edge domination number) of a graph G is the minimum size of a k-connected (resp. k-edge-connected) edge dominating set of G, and denoted by \(\gamma _k(G)\) (resp. \(\gamma '_k(G)\)). In this paper, we investigate the relationship between matching number and 2-connected (resp. 2-edge-connected) edge domination number, and prove that for a graph G, if it is 2-edge-connected, then \(\gamma '_2(G)\le 5\alpha '(G)-2\), and if it is 2-connected, then \(\gamma _2(G)\le 4\alpha '(G)-1\), where \(\alpha '(G)\) is the matching number of G.

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Data Availibility Statement

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

Change history

  • 24 March 2023

    The original version is updated due to spell error in the article title.

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Acknowledgements

The authors are very grateful to the referees and the editor for their valuable comments and suggestions, which greatly improved the presentation of this paper.

Funding

Supported by NSFC No.11071130, “Fundamental Research Funds for the Central Universities", and “Foundation of Department of Science and Technology of Henan (HNGD2022060)".

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Author Contributions: All authors contributed to the study conception and design. All authors commented on previous versions of the manuscript and all authors read and approved the final manuscript. HL: Methodology, Funding acquisition, Writing-Original Draft. AW: Methodology, Validation, Writing. SZ: Validation, Supervision-Review and Editing.

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Correspondence to Hengzhe Li.

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Supported by NSFC No.11071130, “Fundamental Research Funds for the Central Universities", and “Foundation of Department of Science and Technology of Henan (HNGD2022060)".

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Li, H., Wei, A. & Zhang, S. 2-(Edge-)Connected Edge Domination Number and Matching Number. Graphs and Combinatorics 39, 31 (2023). https://doi.org/10.1007/s00373-023-02626-y

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