⊦ m ≤ n → dist(m, n) = n - m
¬ n ≤ n0, m | n, m | n0 ⊦ m | dist(n, n0)
Used simplifier rules: divi-sub: ⊦ m | n ∧ n0 ≤ n → (m | n - n0 ↔ m | n0); Used terms: n0, n