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Proof step 1 from proof ps (conclusion)

⊦ m ≠ 0 → (m + n)-1 +1 = m + n

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ m = 0, (m + n)-1 + 1 = m + n

Rule argument

Additional information

Used simplifier rules: succ: ⊦ m +1 = m + 1;