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Proof step 2 from proof rest-rec (previous step)

0 < n ⊦ restn(n, x) = restn(n -1, x.tail)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ n = 0, restn(n, x) = restn(n - 1, x.tail)

Rule argument

Additional information

Used simplifier rules: ⊦ 0 < n ↔ n ≠ 0; (s)% ⊦ n -1 = n - 1; (s)