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Proof step 2 from proof square-two (previous step)

m ≤ n ⊦ n * n + n = m * 2 ↔ n = m ∧ n < 2

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
m ≤ n ⊦ n * n + n = m * 2 ↔ n = m ∧ m < 2

Rule argument

Additional information