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Proof step 7 from proof gcd-one (previous step)

abs(j) = 1, 0 < i0, 1 < i0, i0 | j ⊦ i0 = 1

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: int-abs name: Abs-neg seq: ⊦ j < 0 → abs(j) = 0 - j subst: [j] → [j] flags: <all paths>

Additional information

Used simplifier rules: div-one-one: ⊦ i | 1 ↔ i = 1 ∨ i = ~1;%div-one-neg-pos: ⊦ 0 < i → (i | ~1 ↔ i = 1);% ⊦ 0 - i = ~ i; (s)% ⊦ ~ i = j ↔ i + j = 0; (s)% ⊦ (* j) = i0 + (* j0) ↔ j - j0 = i0; (s)%add-a: ⊦ i + j + i0 = (i + j) + i0; from specification int-basic2%add-c: ⊦ i + j = j + i; from specification int-basic2%forward-le-02: ⊦ j < i ∧ i ≤ 0 → j < 0; (forward) from specification int-abs% ⊦ ¬ j < 0 → abs(j) = j; (s)% ⊦ i < j ↔ ¬ j ≤ i; (ss)%forward-le-01: ⊦ i ≤ j ∧ 0 ≤ i → 0 ≤ j; (forward) from specification int-abs Used terms: j