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Proof step 9 from proof two-le-two (previous step)

2 < i * i, 0 < i * i, 1 < i * i, abs(i) ≤ 1 ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: int-abs name: abs-one-01 seq: ⊦ i ≠ 0 ∧ i ≠ 1 → (abs(i) ≤ 1 ↔ i = ~1) subst: [i] → [i] flags: <all paths>

Additional information

Used terms: i