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structure definition def or abbrev

GoldenSectionCert

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formal statement (Lean)

  95structure GoldenSectionCert where
  96  ratio_gt_one : 1 < preferredAspectRatio
  97  ratio_in_band : (1.4 : ℝ) < preferredAspectRatio ∧ preferredAspectRatio < 1.9
  98  golden_recursion : preferredAspectRatio * (preferredAspectRatio - 1) = 1
  99  cost_at_ideal : ∀ r : ℝ, r ≠ 0 → proportionCost r r = 0
 100  cost_nonneg : ∀ a i : ℝ, 0 < a → 0 < i → 0 ≤ proportionCost a i
 101

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