0 ≠ m ⊦ align↓(n, m) = (n % m = 0 ⊃ n;n / m * m)
n + (m % n = 0 ⊃ m;m / n * n) ≤ m ⊦ n = 0
Used simplifier rules: aligndown-def: 0 ≠ m ⊦ align↓(n, m) = (n % m = 0 ⊃ n;n / m * m);