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Proof step 1 from proof div-gcd-neg-not-zero (conclusion)

⊦ i0 < 0 → i0 / gcd(i, i0) ≠ 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
i0 / gcd(i, i0) = 0, i0 < 0 ⊦

Rule argument

Additional information

Used simplifier rules: zero-gels-01: ⊦ i < 0 ∧ 0 ≤ j → i < j; from specification int-abs%forward-le-02: ⊦ j < i ∧ i ≤ 0 → j < 0; (forward) from specification int-abs%lf-02: ⊦ i < j ∧ j = i0 → i < i0; (forward) from specification int-basic1