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Proof step 1 from proof euler-phi-prime (conclusion)

⊦ prime(i) → euler-phi(i) = i - 1

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
prime(i) ⊦ i = euler-phi(i) + 1

Rule argument

Additional information

Used simplifier rules: sub-eq: ⊦ i - j = i0 ↔ i = i0 + j; from specification int-abs