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Proof step 1 from proof to-unwind-begin-fin (conclusion)

m < # x ⊦ x to m + 1 = x.head + (x.tail to m)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
m < # x ⊦ x to m + 1 = x.head ' + (x.tail to m), x = []

Rule argument

Additional information

Used simplifier rules: ⊦ # x = 0 ↔ x = []; (s)%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic% ⊦ a + x = a ' + x; (s)