Abstract
Let G = (V, E) be a simple graph. A 3-valued function is said to be a minus dominating function if for every vertex where N[v] is the closed neighborhood of v. The weight of a minus dominating function f on G is The minus domination number of a graph G, denoted by γ−(G), equals the minimum weight of a minus dominating function on G. In this paper, the following two results are obtained.
(1) If G is a bipartite graph of order n, then
(2) For any negative integer k and any positive integer m ⩾ 3, there exists a graph G with girth m such that γ−(G) ≤ k. Therefore, two open problems about minus domination number are solved.
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Liu, H., Sun, L. On the Minus Domination Number of Graphs. Czech Math J 54, 883–887 (2004). https://doi.org/10.1007/s10587-004-6437-1
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DOI: https://doi.org/10.1007/s10587-004-6437-1