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Proof step 14 from proof max-append (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 15:
⊦ x ≠ [] → max(a ' + x) = (max(x) < a ⊃ a;max(x))
Proof step 16:
x1 ≠ [], ∀ x0. max(x1 + x0) = max(x1) ∨ max(x1 + x0) = max(x0) ∨ x1 + x0 = [] ⊦ x1 + x0 = [], max(x1 + x0) = (max(x1) < a ⊃ a;max(x1)), max(x1 + x0) = max(x0), max(x1 + x0) < a

Rule argument

spec: inst: name: max-rec seq: ⊦ x ≠ [] → max(a ' + x) = (max(x) < a ⊃ a;max(x)) subst: [x, a] → [x1, a] flags: rewrite, current

Additional information

Used simplifier rules: max-base: ⊦ max(a ') = a;%Nil: ⊦ [] + x = x; from specification list%a: ⊦ (x + y) + z = x + y + z; from specification list%app: ⊦ x + [] = x; from specification list Used terms: x1, a