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Proof step 1 from proof postfix-one-less (conclusion)

⊦ a ' + x ⊒ y → (¬ x ⊒ y ↔ false)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

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