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Proof step 1 from proof insdel (conclusion)

⊦ ins≤(a, sort(x)) = y → sort(x) = y -1l a

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: del1-02: ⊦ ins≤(a, x) -1l a = x; from specification olist