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Proof step 1 from proof neg-eq (conclusion)

⊦ ~ i = j → (~ j = i ↔ true)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: Minus-def: ⊦ ~ i = 0 - i;%minus-sub: ⊦ ~(i - j) = j - i;%sub-zero-01: ⊦ i - 0 = i;