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structure definition def or abbrev

PIDStabilityCert

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formal statement (Lean)

 148structure PIDStabilityCert where
 149  fixes_equilibrium :
 150    ∀ (f : ℝ → ℝ), RecognitionDescent f → f 1 = 1
 151  preserves_positive_traj :
 152    ∀ (f : ℝ → ℝ) (hf : RecognitionDescent f) (r : ℝ),
 153      0 < r → ∀ n : ℕ, 0 < trajectory f r n
 154  trajectory_fixes_equilibrium :
 155    ∀ (f : ℝ → ℝ), RecognitionDescent f →
 156      ∀ n : ℕ, trajectory f 1 n = 1
 157  cost_descent_off_equilibrium :
 158    ∀ (f : ℝ → ℝ) (hf : RecognitionDescent f) (r : ℝ),
 159      0 < r → r ≠ 1 → Cost.Jcost (f r) < Cost.Jcost r
 160  cost_zero_iff_equilibrium :
 161    ∀ (x : ℝ), 0 < x → (Cost.Jcost x = 0 ↔ x = 1)
 162

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