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Proof step 1 from proof put-butlast (conclusion)

⊦ n < # x → (x + a ')[n, b] = x[n, b] + a '

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: put-app-left: ⊦ n < # x → (x + y)[n, a] = x[n, a] + y;%app-01: ⊦ x + y = x + z ↔ y = z; from specification list%a: ⊦ (x + y) + z = x + y + z; from specification list