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Proof step 1 from proof postfix-same (conclusion)

⊦ x + a ' ⊒ y + a ' ↔ x ⊒ y

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: postfix-app-02: ⊦ y + x ⊒ z + x ↔ y ⊒ z;%a: ⊦ (x + y) + z = x + y + z; from specification list