Abstract
A paired-dominating set of a graph is a dominating set of vertices whose induced subgraph has a perfect matching, while the paired-domination number is the minimum cardinality of a paired-dominating set in the graph. Recently, Chen et al. (Acta Math Sci Ser A Chin Ed 27(1):166–170, 2007) proved that a cubic graph has paired-domination number at most three-fifths the number of vertices in the graph. In this paper, we show that the Petersen graph is the only connected cubic graph with paired-domination number three-fifths its order.
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Research supported in part by the South African National Research Foundation and the University of KwaZulu-Natal.
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Goddard, W., Henning, M.A. A Characterization of Cubic Graphs with Paired-Domination Number Three-Fifths Their Order. Graphs and Combinatorics 25, 675–692 (2009). https://doi.org/10.1007/s00373-010-0884-2
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DOI: https://doi.org/10.1007/s00373-010-0884-2