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erdos_189.variants.square

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Lean 4 Statement 
theorem erdos_189.variants.square :
    ¬ Erdos189For
      (fun a b c d ↦
        line[ℝ, a, b].direction ⟂ line[ℝ, b, c].direction ∧
        line[ℝ, b, c].direction ⟂ line[ℝ, c, d].direction ∧
        line[ℝ, c, d].direction ⟂ line[ℝ, d, a].direction ∧
        dist a b = dist b c)
      (fun a b c d ↦ dist a b * dist b c)
ID: ErdosProblems__189__erdos_189.variants.square
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