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Proof step 1 from proof gcd-add (conclusion)

⊦ 0 < i ∧ 0 < j → gcd(i + j, j) = gcd(i, j)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
0 < i, 0 < j ⊦ gcd(i + j, j) = gcd(i, j)

Rule argument

Additional information

Used simplifier rules: forward-le-05: ⊦ i < j ∧ 0 ≤ i → 0 < j; (forward) from specification int-abs