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Proof step 3 from proof sort-max-max-list (previous step)

⊦ max(sort(x)) = max(x), x = []

User applied rule structural induction

And obtained the following new goals

Proof step 4:
max(sort(x0)) = max(x0) ∨ x0 = [] ⊦ a + x0 = [], max(sort(a + x0)) = max(a + x0)

Rule argument

indvar: x

Additional information

Used simplifier rules: list freely generated by [], +;;