| ⌜n⌝ + ⌜1⌝ < # nσ, nσ ≠ [] ∧ nσ[0] = 0 ∧ (∀ n. ⌜n⌝ + ⌜1⌝ < # nσ → nσ[n + 1] = nσ[n] ∨ nσ[n + 1] = nσ[n] + 1), nσ[n + 1] < nσ[n] ⊦ nσ[n] = 0 |
nσ[0] = 0, ⌜n⌝ + ⌜1⌝ < # nσ, nσ[n + 1] < nσ[n], ∀ n. ⌜n⌝ + ⌜1⌝ < # nσ → nσ[n + 1] = nσ[n] ∨ nσ[n + 1] = nσ[n] + 1 ⊦ nσ[n] = 0, nσ = []