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Proof step 1 from proof sgn-02-01 (conclusion)
⊦ sgn(i) * j = sgn(i) * j0 ↔ j = j0
Heuristic simplifier applied rule simplifier
And obtained the following new goals
Proof step 2
:
sgn(i) * j = sgn(i) * j0 ⊦ j = j0
Rule argument
Additional information