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Proof step 1 from proof square-eq (conclusion)

⊦ m * (m + 1) = n * (n + 1) ↔ m = n

User applied rule case distinction

And obtained the following new goals

Proof step 2:
m * (m + 1) = n * (n + 1) ⊦ m = n

Rule argument

pos: right 1

Additional information