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Rainbow domination in the lexicographic product of graphs

机译:图的词典产品中的彩虹控制

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A k-rainbow dominating function of a graph G is a map f from V(G) to the set of all subsets of {1,2,?,k} such that {1, ?,k}=∪ _(u ε N(v))f(u) whenever v is a vertex with f(v)=0ì?. The k-rainbow domination number of G is the invariant γ_(rk)(G), which is the minimum sum (over all the vertices of G) of the cardinalities of the subsets assigned by a k-rainbow dominating function. We focus on the 2-rainbow domination number of the lexicographic product of graphs and prove sharp lower and upper bounds for this number. In fact, we prove the exact value of γ_(r2)(Ga ° H) in terms of domination invariants of G except for the case when γ_(r2)(H)=3 and there exists a minimum 2-rainbow dominating function of H such that there is a vertex in H with the label {1,2}.
机译:图G的k彩虹支配函数是从V(G)到{1,2,?,k}的所有子集的集合的映射f,使得{1,?,k} =∪_(uε N(v))f(u)每当v是一个f(v)=0ì?的顶点时。 G的k彩虹支配数是不变量γ_(rk)(G),它是由k彩虹支配函数分配的子集的基数的最小总和(在G的所有顶点上)。我们专注于图的字典积的2彩虹控制数,并证明该数字的上下边界明显。实际上,我们证明了根据G的控制不变性,γ_(r2)(Ga°H)的精确值,除了当γ_(r2)(H)= 3且存在最小的2虹主导函数H,使得H中有一个标记为{1,2}的顶点。

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