Jungles, bundles, and fixed parameter tractability

Fedor V. Fomin, Michał Pilipczuk

We give a fixed-parameter tractable (FPT) approximation algorithm computing the path-width of a tournament, and more generally, of a semi-complete digraph. Based on this result, we prove that topological containment and rooted immersion problems are FPT on semi-complete digraphs.

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