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Proof step 1 from proof mk-rest (conclusion)

⊦ n ≠ 0 → mklist(a, n).rest = mklist(a, n -1)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ n = 0, mklist(a, n).rest = mklist(a, n - 1)

Rule argument

Additional information

Used simplifier rules: pred-03: ⊦ n -1 = n - 1; from specification nat