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erdos_196

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Must every permutation of $\mathbb{N}$, contain a monotone 4-term arithmetic progression?

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Lean 4 Statement 
theorem erdos_196 : answer(sorry) ↔ ∀ (f : ℕ ≃ ℕ), HasMonotoneAP f 4
ID: ErdosProblems__196__erdos_196
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