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Let D = ( V ( D ) , A ( D ) ) be a digraph. A subset S ⊆ V ( D ) is k -independent if the distance between every pair of vertices of S is at least k , and it is ℓ -absorbent if for every vertex u in V ( D ) ∖ S there exists v ∈ S such that the distance from u to v is less than or equal to ℓ . A k -kernel is a k -independent and ( k − 1 ) -absorbent set. A kernel...
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