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Proof step 2 from proof get-last-04 (previous step)

⊦ x = [], (a ' + x + y)[# x] = (a ' + x).last

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ x = [], (a ' + x + y)[# x] = x.last

Rule argument

Additional information

Used simplifier rules: a: ⊦ (x + y) + z = x + y + z; from specification list%l-02: ⊦ x ≠ [] → (a ' + x).last = x.last; from specification list-last