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Proof step 4 from proof neg-neg (previous step)

⊦ j = 0, rational(~ i, ~ j).num = rational(i, j).num ∧ rational(~ i, ~ j).denom = rational(i, j).denom

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
⊦ j = 0, rational(~ i, ~ j).denom = rational(i, j).denom

Rule argument

Additional information

Used simplifier rules: num-neg: ⊦ j ≠ 0 → rational(~ i, ~ j).num = rational(i, j).num;