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On the Erd\H{o}s-P\'osa property for immersions and topological minors in tournaments
2022
Discrete Mathematics & Theoretical Computer Science
We consider the Erd\H{o}s-P\'osa property for immersions and topological minors in tournaments. We prove that for every simple digraph $H$, $k\in \mathbb{N}$, and tournament $T$, the following statements hold: (i) If in $T$ one cannot find $k$ arc-disjoint immersion copies of $H$, then there exists a set of $\mathcal{O}_H(k^3)$ arcs that intersects all immersion copies of $H$ in $T$. (ii) If in $T$ one cannot find $k$ vertex-disjoint topological minor copies of $H$, then there exists a set of
doi:10.46298/dmtcs.7099
fatcat:gyvhc7t3ifdadazm2uzhif7zry