Problem

erdos:209

False ↔ ∀ (d : ℕ), 4 ≤ d → ∀ (A : Finset (AffineSubspace ℝ (EuclideanSpace ℝ (Fin 2)))), A.card = d → (∀ L ∈ A, Erdos209.IsLine L) → ((↑A).Pairwise fun L₁ L₂ => ¬L₁.Parallel L₂) → (∀ (p : EuclideanSpace ℝ (Fin 2)), Erdos209.pointMultiplicity A p ≤ 3) → Erdos209.HasGallaiTriangle A

Open Current State

Declared status: disproved (Lean)
Formalization: formalized
Subjects: geometry
OEIS: N/A
Sources: source:erdos-ai-contributions-wikisource:erdos-problemssource:formal-conjecturessource:jayyhk-erdos-lean
Statement: www.erdosproblems.com

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