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Proof step 1 from proof prop-p (conclusion)

⊦ m -1 = n -1 ∧ m ≠ 0 ∧ n ≠ 0 → m = n

System applied rule normalize

And obtained the following new goals

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

Rule argument

Additional information