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Proof step 1 from proof one-pos (conclusion)

j ≠ 0 ⊦ 0 < 1 / j ↔ j = 1

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
0 < 1 / j ⊦ j = 0, j = 1

Rule argument

Additional information

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