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Proof step 5 from proof get-last-04 (previous step)

⊦ # x = 0, (x + y)[(# x)-1] = x.last, x = []

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
⊦ (x + y)[# x - 1] = x.last, x = []

Rule argument

Additional information

Used simplifier rules: ⊦ # x = 0 ↔ x = []; (s)% ⊦ n -1 = n - 1; (s)