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Conflict-free Hypergraph Matchings and Coverings

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arxiv 2407.18144 v2 pith:PJTXOK5M submitted 2024-07-25 math.CO

classification math.CO
keywords conflict-freehypergraphalmost-perfectapplicationsconflictsedgesmanymatching
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abstract

Recent work showing the existence of conflict-free almost-perfect hypergraph matchings has found many applications. We show that, assuming certain simple degree and codegree conditions on the hypergraph $ \mathcal{H} $ and the conflicts to be avoided, a conflict-free almost-perfect matching can be extended to one covering all of the vertices in a particular subset of $ V(\mathcal{H}) $, by using an additional set of edges; in particular, we ensure that our matching avoids all of a further set of conflicts, which may consist of both old and new edges. This setup is useful for various applications, and our main theorem provides a black box which encapsulates many long and tedious calculations, massively simplifying the proofs of results in generalised Ramsey theory.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Erd\H{o}s meets Nash-Williams

    math.CO 2025-07 conditional novelty 8.0 of 10

    Every sufficiently large triangle-divisible graph with minimum degree at least (7+√21)/14 + epsilon has a triangle decomposition with arbitrarily large girth.

  2. Edge-coloring $K_{n, n}$ with no 2-colored $C_{2k}$

    math.CO 2025-07 accept novelty 7.0 of 10

    The minimum number of colors in a (C_{2k},3)-coloring of K_{n,n} is exactly (7/20)n+o(n) for k=3 and lies between improved explicit bounds for all k≥4.

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