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Two vertices in a graph are said to 2-step dominate each other if they are at distance 2 apart. A set S of vertices in a graph G is a 2-step dominating set of G if every vertex is 2-step dominated by some vertex of S. A subset S of vertices of G is a hop dominating set if every vertex outside S is 2-step dominated by some vertex of S. The hop domination number, $$\gamma _{h}(G)$$ γ h ( G...
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