⊦ mon<(nσ) ↔ (∀ n. ⌜n⌝ + ⌜1⌝ < # nσ → nσ[n] < nσ[n + 1])
∀ n. ⌜n⌝ + ⌜1⌝ < # ⌜nnf⌝ → ⌜nnf⌝ [n] < ⌜nnf⌝ [n + 1], 1 + n0 < n, nnf(n0 + 1) ≤ nnf(n0) ⊦ n = 0
Used terms: ⌜nnf⌝