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Proof step 1 from proof put-firstn-restn (conclusion)

⊦ n < # x → x[n, a] = firstn(n, x) + a ' + restn(n + 1, x)

System applied rule normalize

And obtained the following new goals

Proof step 2:
n < # x ⊦ x[n, a] = firstn(n, x) + a ' + restn(n + 1, x)

Rule argument

Additional information