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On Graphs with Disjoint Dominating and 2-Dominating Sets
1Department of Mathematics University of Johannesburg Auckland Park, 2006 South Africa
2Department of Mathematics Furman University Greenville, SC, USA
Citation Information: Discussiones Mathematicae Graph Theory. Volume 33, Issue 1, Pages 139–146, ISSN (Print) 2083-5892, DOI: 10.7151/dmgt.1652, April 2013
- Published Online:
A DD2-pair of a graph G is a pair (D,D2) of disjoint sets of vertices of G such that D is a dominating set and D2 is a 2-dominating set of G. Although there are infinitely many graphs that do not contain a DD2-pair, we show that every graph with minimum degree at least two has a DD2-pair. We provide a constructive characterization of trees that have a DD2-pair and show that K3,3 is the only connected graph with minimum degree at least three for which D ∪ D2 necessarily contains all vertices of the graph.