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Proof step 2 from proof mod2-neg-odd (previous step)

j < 0 ⊦ j % 2 = ~1 ↔ j % 2 ≠ 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
j < 0 ⊦ j % 2 = ~1 ↔ j % 2 ≠ 0

Rule argument

Additional information

Used simplifier rules: forward-le-02: ⊦ j < i ∧ i ≤ 0 → j < 0; (forward) from specification int-abs