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A three-valued function f defined on the vertex set of a graph G=(V,E), f:V->{-1,0,1} is a minus dominating function if the sum of its function values over any closed neighborhood is at least one. That is, for every v V, f(N[v])>=1, where N[v] consists of v and all vertices adjacent to v. The weight of a minus function is f(V)= vV f(v). The minus domination number of a graph...
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