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Erdős problem 108

For every r ≥ 4 and k ≥ 2 is there some finite f(k,r) such that every graph of chromatic number ≥ f(k,r) contains a subgraph of girth ≥ r and chromatic number ≥ k?

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Retained declaration

FormalConjectures/ErdosProblems/108.lean

Formal Conjectures

FormalConjectures/ErdosProblems/108.leanErdos108.erdos_1086 linesExact file
Truer ≥ 4,k ≥ 2,f,        ∀ (V : Type u) (G : SimpleGraph V),          Nonempty V → ↑fG.chromaticNumber → ∃ H, H.coe.girthrH.coe.chromaticNumber ≥ ↑k
OpenStatement only, no proof

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