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Proof step 10 from proof negate-eq (previous step)

rational(0, 1) = (0r - rj) + ri ⊦ ri = rj

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 11:
rational(0, 1) = (rational(0, 1) - rj) + ri ⊦ ri = rj

Rule argument

Additional information

Used simplifier rules: zero-def: ⊦ 0r = rational(0, 1);