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erdos_318.contain_single_even

Specification

For any set `A` containing exactly one even number, `A` does not have property `P₁`. Sattler [Sa82] credits this observation to Erdős, who presumably found this after [ErGr80].

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Lean 4 Statement 
theorem erdos_318.contain_single_even {A : Set ℕ} (hA : {n | n ∈ A ∧ Even n}.ncard = 1) :
    ¬ P₁ {n | IsSquare n}
ID: ErdosProblems__318__erdos_318.contain_single_even
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