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Proof step 1 from proof sublist-last (conclusion)

⊦ m0 + n < # x → sublist(m0, n + 1, x).last = x[m0 + n]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
m0 + n < # x ⊦ (restn(m0, x).first ' + firstn(n, restn(m0, x).rest)).last = x[m0 + n], x = []

Rule argument

Additional information

Used simplifier rules: sublist-def: ⊦ sublist(m, n, x) = firstn(n, restn(m, x));%firstN-rec: ⊦ firstn(n + 1, x) = x.first + firstn(n, x.rest);%l: ⊦ # x = 0 ↔ x = []; from specification list-data%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic1%c: ⊦ m + n = n + m; from specification nat-basic2%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic2%c: ⊦ a + x = a ' + x; from specification list