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Proof step 1 from proof app-05 (conclusion)

⊦ perm(x + a ', y + a ') ↔ perm(x, y)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: app-01: ⊦ perm(x + y, z + y) ↔ perm(x, z);%a: ⊦ (x + y) + z = x + y + z; from specification list