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Proof step 21 from proof rec (previous step)

a ' + x = x0 + a0 ' + y + a0 ' + z, a0 ∈ x, a ∈ z ∨ a ∈ y ∨ a ∈ x0 ⊦ x = x0.tail + a0 ' + y + a0 ' + z, a ∈ x, ∃ a0, x0, y, z. x = x0 + a0 ' + y + a0 ' + z

Heuristic elimination applied rule insert elim lemma

And closed the goal!

Rule argument

spec: list-data name: elim-list-c seq: x ≠ [] ⊦ a = x.head ∧ y = x.tail ↔ x = a + y subst: [x, a, y] → [x0, a1, y0]

Additional information

Used simplifier rules: ⊦ a + x = a ' + x; (s)%a: ⊦ (x + y) + z = x + y + z; from specification list% ⊦ a ' + x = b ' + y ↔ a = b ∧ x = y; (ws)% ⊦ [] + x = x; (s)%x ≠ [] ⊦ a = x.head ∧ y = x.tail ↔ x = a + y; (elim) Used terms: x0, a1, y0