∀ {α : Sort u} {motive : α → Sort v} (h : α → ℕ)
  (F F_1 : (x : α) → ((y : α) → InvImage (fun x1 x2 => x1 < x2) h y x → motive y) → motive x),
  F = F_1 →
    ∀ (fuel fuel_1 : ℕ) (e_fuel : fuel = fuel_1) (x : α) (a : h x < fuel),
      WellFounded.Nat.fix.go h F fuel x a = WellFounded.Nat.fix.go h F_1 fuel_1 x ⋯