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Proof step 1 from proof restN-append (conclusion)

⊦ n ≤ # x → restn(n, x + y) = restn(n, x) + y

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
n ≤ # x ⊦ restn(n, x + y) = restn(n, x) + y

Rule argument

Additional information