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Multiple factor NordhausGaddum type results for domination and total domination

机译:统治和总统治的多因素Nordhaus Gaddum类型结果

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A NordhausGaddum-type result is a (tight) lower or upper bound on the sum or product of a parameter of a graph and its complement. In this paper we examine the sum and product of ~(γt)(~(G1)), ~(γt)(~(G2)),..., ~(γt)(~(Gk)) and the sum of γ(~(G1)),γ(~(G2)),...,γ(~(Gk)) where ~(G1? G2??? Gk)= ~(Kn) for positive integers n and k, γ(G) is the domination number and ~(γt)(G) is total domination number of a graph G. We show that ∑j=1kγ(~(Gj))≤(k-1)n+1 with equality if and only if ~(Gi)= ~(Kn) for some i∈1,...,k. For n≥7, 3≤k≤n-2 and δ(~(Gi))≥1 for each i∈1,2,...,k, we show that ∑j=1k ~(γt)(~(Gj))≤(k-1)(n+1).
机译:NordhausGaddum类型的结果是图形参数及其补码的总和或乘积的(紧)下限或上限。在本文中,我们检查了〜(γt)(〜(G1)),〜(γt)(〜(G2)),...,〜(γt)(〜(Gk))的和与积。 γ(〜(G1)),γ(〜(G2)),...,γ(〜(Gk))其中,对于正整数n和k,〜(G1?G2 ??? Gk)=〜(Kn), γ(G)是图形G的支配数,〜(γt)(G)是图G的总支配数。我们证明∑j =1kγ(〜(Gj))≤(k-1)n + 1并且仅当对于某些i∈1,...,k〜(Gi)=〜(Kn)时。对于n≥7、3≤k≤n-2和δ(〜(Gi))≥1的每个i∈1,2,...,k,我们证明∑j = 1k〜(γt)(〜( Gj))≤(k-1)(n + 1)。

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