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Induced even cycles in locally sparse graphs

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arxiv 2411.12659 v1 pith:AC4UUCXI submitted 2024-11-19 math.CO

classification math.CO
keywords sparseeverygraphinducedvertexconjecturecontainscopy
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abstract

A graph $G$ is $(c,t)$-sparse if for every pair of vertex subsets $A,B\subset V(G)$ with $|A|,|B|\geq t$, $e(A,B)\leq (1-c)|A||B|$. In this paper we prove that for every $c>0$ and integer $\ell$, there exists $C>1$ such that if an $n$-vertex graph $G$ is $(c,t)$-sparse for some $t$, and has at least $C t^{1-1/\ell}n^{1+1/\ell}$ edges, then $G$ contains an induced copy of $C_{2\ell}$. This resolves a conjecture of Fox, Nenadov and Pham.

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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. $C_4$-free subgraphs of high degree with geometric applications

    math.CO 2025-06 conditional novelty 8.0 of 10

    A new dichotomy about C4-free induced subgraphs and dense patches yields optimal O(sn) bounds for geometric Zarankiewicz problems and a near-tight semilinear bound.

  2. Supersaturation of induced even cycles in locally sparse graphs

    math.CO 2026-08 accept novelty 7.0 of 10

    For every integer ℓ≥2, any (1−ε,t)-sparse n-vertex graph with at least C t^{1−1/ℓ} n^{1+1/ℓ} edges contains at least C' d^{2ℓ} induced copies of the even cycle C_{2ℓ}, where d is its average degree.

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