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Graphs with large minimum degree and no small odd cycles are $3$-colourable

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arxiv 2302.01875 v2 pith:VHGRZGOH submitted 2023-02-03 math.CO

classification math.CO
keywords degreeminimumcolourablecycleslargeproveansweringenough
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abstract

Answering a question by Letzter and Snyder, we prove that for large enough $k$ any $n$-vertex graph $G$ with minimum degree at least $\frac{1}{2k-1}n$ and without odd cycles of length less than $2k+1$ is $3$-colourable. In fact, we prove a stronger result that works with a slightly smaller minimum degree.

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Cited by 3 Pith papers

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

  1. Interpolating chromatic and homomorphism thresholds

    math.CO 2025-02 conditional novelty 8.0 of 10

    The authors determine the exact VC-dimension-interpolated homomorphism thresholds for cliques and prove the blowup threshold of odd cycles C_{2k-1} is 1/(2k-1).

  2. On the spectrum and structure of blowup thresholds

    math.CO 2026-07 accept novelty 7.0 of 10

    Blowup thresholds are always positive for non-bipartite H, fail monotonicity under induced subgraphs, and equal 1/4 for certain constrained odd-cycle blowups.

  3. On the structure of dense graphs with given odd girth

    math.CO 2026-07 accept novelty 6.0 of 10

    Every n-vertex graph with odd girth at least 2k+1 and minimum degree greater than 4n/(6k−1) is homomorphic to the Möbius ladder M_{4k}.

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