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Proof step 7 from proof max-sort-sublist (previous step)

∀ x0. x1 + x0 = [] ∨ max(x1 + x0) = max(x0) ∨ max(x1 + x0) = max(x1) ⊦ max(a ' + x1 + x0) = max(a ' + x1), max(a ' + x1 + x0) = max(x0)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 8:
⊦ x ≠ [] → max(a ' + x) = (max(x) < a ⊃ a;max(x))
Proof step 9:
∀ x0. x1 + x0 = [] ∨ max(x1 + x0) = max(x0) ∨ max(x1 + x0) = max(x1) ⊦ x1 + x0 = [], (max(x1 + x0) < a ⊃ a;max(x1 + x0)) = max(x0), (max(x1 + x0) < a ⊃ a;max(x1 + x0)) = max(a ' + x1)

Rule argument

spec: <toplevel> name: max-rec seq: ⊦ x ≠ [] → max(a ' + x) = (max(x) < a ⊃ a;max(x)) subst: [x, a] → [x1 + x0, a] flags: <all paths>

Additional information

Used simplifier rules: max-base: ⊦ max(a ') = a;% ⊦ x + y = [] ↔ x = [] ∧ y = []; (as)%a: ⊦ (x + y) + z = x + y + z; from specification list% ⊦ [] + x = x; (s)% ⊦ x + [] = x; (s) Used terms: x1 + x0, a