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Proof step 3 from proof square-two (previous step)

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

User applied rule insert equation

And obtained the following new goals

Proof step 4:
n * n + n ≤ n * 2, n * n + n = m * 2, m ≤ n ⊦ n = m ∧ m < 2

Rule argument

pos: left 2 flags: rotate

Additional information