⊦ mon<(nσ) ↔ (∀ n. ⌜n⌝ + ⌜1⌝ < # nσ → nσ[n] < nσ[n + 1])
∀ n. ⌜n⌝ + ⌜1⌝ < #(⌜nl⌝ + ⌜nl0⌝ ) → (⌜nl⌝ + ⌜nl0⌝ )[n] < (⌜nl⌝ + ⌜nl0⌝ )[n + 1] ⊦ mon<(⌜nl0⌝ )
Used terms: ⌜nl⌝ + ⌜nl0⌝