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Proof step 7 from proof putset-same (previous step)

n0 + 1 < # x, ∀ x. n0 < # x → x[n0, x[n0]] = x ∨ x = [] ⊦ x[n0 + 1, x.tail[n0]] = x, x = []

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Proof step 8:
x = a + y, n0 + 1 < # x, ∀ x. n0 < # x → x[n0, x[n0]] = x ∨ x = [] ⊦ x[n0 + 1, y[n0]] = x, x = []

Rule argument

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

Additional information

Used simplifier rules: x ≠ [] ⊦ a = x.head ∧ y = x.tail ↔ x = a + y; (elim) Used terms: x, a, y