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Proof step 4 from proof modmod-mult-02 (previous step)

0 < j, i < 0, i0 < 0 ⊦ (i % j * i0 % j) % j = (i * i0) % j

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
i < 0, 0 < j, i0 < 0 ⊦ (i % j * i0 % j) % j = (i * i0) % j

Rule argument

Additional information

Used simplifier rules: forward-le-02: ⊦ j < i ∧ i ≤ 0 → j < 0; (forward) from specification int-abs