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Proof step 2 from proof num-lastN (previous step)

0 < n ⊦ lastn(n, x + a ') = lastn(n -1, x) + a '

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ lastn(n, x + a ') = lastn(n - 1, x) + a ', n = 0

Rule argument

Additional information

Used simplifier rules: zero: ⊦ 0 < m ↔ m ≠ 0; from specification nat-basic1%pred-03: ⊦ n -1 = n - 1; from specification nat