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Proof step 2 from proof aleb-not-mapped (previous step)

⊦ aleb = unmapped, aleb.mapped?

User applied rule structural induction

And closed the goal!

Rule argument

indvar: aleb

Additional information

Used simplifier rules: gen: ⊦ ;%disj: ⊦ unmapped ≠ mapped(buf);%test-02: ⊦ mapped(buf).mapped?;