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inscribed_square_problem

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**Inscribed square problem** Does every Jordan curve admit an inscribed square?

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Lean 4 Statement 
theorem inscribed_square_problem :
    answer(sorry) ↔ ∀ (γ : Circle → ℝ²) (hγ : IsEmbedding γ),
      ∃ t₁ t₂ t₃ t₄, IsRectangle (γ t₁) (γ t₂) (γ t₃) (γ t₄) 1
ID: Wikipedia__InscribedSquare__inscribed_square_problem
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