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Proof step 1 from proof del-del1-switch (conclusion)

⊦ a ≠ b → (x -1l a) -l b = (x -l b) -1l a

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ (x -1l a) -l b = (x -l b) -1l a, a = b

Rule argument

Additional information