domination;
minus domination;
total minus domination;
k-partite graph;
D O I:
10.1016/j.disc.2006.03.004
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
A function f defined on the vertices of a graph G = (V, E), f : V -> {-1, 0, 1} is a total minus dominating function (TMDF) if the sum of its values over any open neighborhood is at least one. The weight of a TMDF is the sum of its function values over all vertices. The total minus domination number, denoted by gamma(-)(t) (G), of G is the minimum weight of a TMDF on G. In this paper, a sharp lower bound on gamma(-)(t) of k-partite graphs is given. (c) 2006 Elsevier B.V. All rights reserved.