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erdos_318.posDensity

Specification

There exists a set `A` with positive density that does not have property `P₁`. #TODO: prove this lemma by assuming `erdos_318.contain_single_even`.

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Lean 4 Statement 
theorem erdos_318.posDensity : ∃ A : Set ℕ, HasPosDensity A ∧ ¬ P₁ A
ID: ErdosProblems__318__erdos_318.posDensity
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