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Given a digraph D=(V,A) and a positive integer k, a subset B⊆A is called a k-arborescence, if it is the disjoint union of k spanning arborescences. When also arc-costs c:A→R are given, minimizing the cost of a k-arborescence is well-known to be tractable. In this paper we take on the following problem: what is the minimum cardinality of a set of arcs the removal of which destroys every minimum c-cost...
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