m < n ⊦ m = 0, n = 0, gcd(m, n) ≤ m ∧ gcd(m, n) ≤ n
⊦ m = 0, n = 0, m < n, gcd(m, n) ≤ m ∧ gcd(m, n) ≤ n
Used formulas: m < n