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theorem proved term proof

D_sq_cube_faces_minus_gap

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formal statement (Lean)

  75theorem D_sq_cube_faces_minus_gap : (5 : ℕ)^2 * 6 - 45 = 105 := by decide

proof body

Term-mode proof.

  76
  77/-- Cube faces × cube faces = 36 (face pairings on Q₃). -/