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theorem proved term proof

cube_sq_plus_cube

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formal statement (Lean)

  69theorem cube_sq_plus_cube : (2 : ℕ)^3 * 2^3 + 2^3 = 72 := by decide

proof body

Term-mode proof.

  70
  71/-- D × cube faces = 30 (configDim × cube-face count). -/

depends on (3)

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