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baumgartner_headline

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The statement for which Baumgartner actually writes a proof.

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Lean 4 Statement 
lemma baumgartner_headline (V : Type*) [AddCommGroup V] [Module ℚ V] :
    ∃ X : Set V,
      (∀ Y, IsAPOfLength Y ⊤ → (X ∩ Y).Nonempty) ∧
      (∀ Y, IsAPOfLength Y 3 → (X ∩ Y).ncard ≤ 2)
ID: ErdosProblems__198__baumgartner_headline
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