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Proof step 2 from proof aligndown-add-same (previous step)

⊦ align↓(n0 + n1, m) = align↓(n0, m) ↔ n0 % m + n1 < m, m = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
0 ≠ m ⊦ align↓(n, m) = (n % m = 0 ⊃ n;n / m * m)
Proof step 4:
⊦ ((n0 + n1) % m = 0 ⊃ n0 + n1;(n0 + n1) / m * m) = (n0 % m = 0 ⊃ n0;n0 / m * m) ↔ n0 % m + n1 < m, m = 0

Rule argument

Additional information

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