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Extremal results for graphs avoiding a rainbow subgraph

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arxiv 2204.07567 v3 pith:5JREKGYG submitted 2022-04-15 math.CO

classification math.CO
keywords graphsrainbowthreeavoidingedgeconjecturecopymaximum
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abstract

We say that $k$ graphs $G_1,G_2,\dots,G_k$ on a common vertex set of size $n$ contain a rainbow copy of a graph $H$ if their union contains a copy of $H$ with each edge belonging to a distinct $G_i$. We provide a counterexample to a conjecture of Frankl on the maximum product of the sizes of the edge sets of three graphs avoiding a rainbow triangle. We propose an alternative conjecture, which we prove under the additional assumption that the union of the three graphs is complete. Furthermore, we determine the maximum product of the sizes of the edge sets of three graphs or four graphs avoiding a rainbow path of length three.

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

  1. Hypergraph Tur\'an problem of the generalized triangle with bounded matching number

    math.CO 2025-07 conditional novelty 7.0 of 10

    For n≥30(s+1), every F5-free 3-graph with matching number at most s has at most s⌊(n−s)^2/4⌋ edges, with equality only for the complete 3-partite hypergraph H3(n,s).

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