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theorem proved term proof

cube_volume_surface

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formal statement (Lean)

  53theorem cube_volume_surface (L : ℕ) (hL : 0 < L) :
  54    (6 * L ^ 2 : ℕ) > 0 ∧ (L ^ 3 : ℕ) > 0 := by

proof body

Term-mode proof.

  55  constructor
  56  · positivity
  57  · positivity
  58
  59/-- The surface-to-volume ratio of a cube: 6L²/L³ = 6/L.
  60    This decreases with L, confirming surface < volume scaling. -/

depends on (8)

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