n0 ≤ m, n0 ≤ n ⊦ n0 = min(min(m, n), n0)
Used simplifier rules: Min-right: ⊦ ¬ m < n → min(m, n) = n;%lels: ⊦ ¬ m < n ↔ n ≤ m; from specification nat