Jean-Florent Raymond - Hitting minors, subdivisions, and immersions in tournaments

dmtcs:3139 - Discrete Mathematics & Theoretical Computer Science, January 17, 2018, Vol. 20 no. 1 - https://doi.org/10.23638/DMTCS-20-1-5
Hitting minors, subdivisions, and immersions in tournamentsArticle

Authors: Jean-Florent Raymond ORCID

    The Erdős-Pósa property relates parameters of covering and packing of combinatorial structures and has been mostly studied in the setting of undirected graphs. In this note, we use results of Chudnovsky, Fradkin, Kim, and Seymour to show that, for every directed graph $H$ (resp. strongly-connected directed graph $H$), the class of directed graphs that contain $H$ as a strong minor (resp. butterfly minor, topological minor) has the vertex-Erdős-Pósa property in the class of tournaments. We also prove that if $H$ is a strongly-connected directed graph, the class of directed graphs containing $H$ as an immersion has the edge-Erdős-Pósa property in the class of tournaments.


    Volume: Vol. 20 no. 1
    Section: Graph Theory
    Published on: January 17, 2018
    Accepted on: January 11, 2018
    Submitted on: February 13, 2017
    Keywords: Computer Science - Discrete Mathematics,05C70,G.2.2

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