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Proof step 6 from proof eqdef (previous step)

ordered≤(a ' + x0), a ∈ y ∧ perm(x0, y -1l a), ordered≤(y), ∀ y0. perm(x0, y0) ∧ ordered≤(y0) → x0 = y0 ⊦ a ' + x0 = y

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information