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Proof step 1 from proof square-interval (conclusion)

(m * (m + 1)) / 2 ≤ (n * (n + 1)) / 2 + n0, (n * (n + 1)) / 2 + n0 < ((m + 1) * (m + 2)) / 2, n0 ≤ n ⊦ m = n

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information