Electronic Journal of Graph Theory and Applications | |
Some new results on the b-domatic number of graphs | |
Noureddine Ikhlef-Eschouf1  Mustapha Chellali2  Mohamed Benattalah3  | |
[1] Department of Mathematics and Computer Science, Faculty of Sciences, University Dr. Yahia Farès of Médéa, Algeria.;LAMDA-RO Laboratory, Department of MathematicsUniversity of Blida, Algeria.;RECITS Laboratory, Faculty of SciencesUZA, Djelfa, Algeria.; | |
关键词: domatic number, b-domatic number, nordhaus-gaddum inequalities; | |
DOI : 10.5614/ejgta.2021.9.1.5 | |
来源: DOAJ |
【 摘 要 】
A domatic partition P of a graph G=(V,E) is a partition of V into classes that are pairwise disjoint dominating sets. Such a partition P is called b-maximal if no larger domatic partition P' can be obtained by gathering subsets of some classes of P to form a new class. The b-domatic number bd(G) is the minimum cardinality of a b-maximal domatic partition of G. In this paper, we characterize the graphs G of order n with bd(G) ∈ {n-1,n-2,n-3}. Then we prove that for any graph G on n vertices, bd(G)+bd(Ġ) ≤ n+1, where Ġ is the complement of G. Moreover, we provide a characterization of the graphs G of order n with bd(G)+bd(Ġ) ∈ {n+1,n} as well as those graphs for which bd(G)=bd(Ġ)=n/2.
【 授权许可】
Unknown