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Proof step 1 from proof square-le-one (conclusion)

⊦ 0 < i → (sqrt(i) ≤ 1 ↔ i < 4)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
0 < i ⊦ sqrt(i) ≤ 1 ↔ i < 4

Rule argument

Additional information

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