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Proof step 2 from proof modmod-add-case (previous step)

0 < j ⊦ (i + i0 % j) % j = (i + i0) % j, (i + i0 % j) % j = (i + i0) % j + j, (i + i0 % j) % j = (i + i0) % j - j

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
0 < j ⊦ (i + i0 % j) % j = (i + i0) % j + j, (i + i0 % j) % j = (i + i0) % j, (i + i0) % j = (i + i0 % j) % j + j

Rule argument

Additional information

Used simplifier rules: forward-le-05: ⊦ i < j ∧ 0 ≤ i → 0 < j; (forward) from specification int-abs% ⊦ i - j = i0 ↔ i = i0 + j; (s)