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Proof step 20 from proof from-succ (previous step)

⊦ n0 = 0, nf(n0 + n) = nf((n + 1) + (n0 - 1))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 21:
⊦ n0 = 0, nf(n0 + n) = nf((n + 1) + (n0 - 1))

Rule argument

Additional information