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Proof step 5 from proof gcd-zero-05 (previous step)

gcd(i0, j0) = ~ gcd(i, j) ⊦ ~ gcd(i, j) = 0 ∧ gcd(i, j) = 0

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 6:
⊦ ~ i = 0 ↔ i = 0
Proof step 7:
gcd(i0, j0) = ~ gcd(i, j) ⊦ gcd(i, j) = 0 ∧ gcd(i, j) = 0

Rule argument

spec: int-abs inst: name: neg-10 seq: ⊦ ~ i = 0 ↔ i = 0 subst: [i] → [gcd(i, j)] flags: rewrite

Additional information

Used terms: gcd(i, j)