⌜m⌝ < # nσ, nσ[0] < nσ[m], mon<(nσ) ⊦ ∃ m0. nσ[m0] < nσ[m] ∧ nσ[m] ≤ nσ[m0 + 1] ∧ m0 ≤ m
Used simplifier rules: ⊦ m ≤ m; (s)