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Proof step 4 from proof square-four (previous step)

0 < 2 * sqrt(4) + 1 ^2, 0 < sqrt(4) ^2 + 2 * sqrt(4) + 1 ^2, sqrt(4) ^2 ≤ 4, 4 < sqrt(4) ^2 + 2 * sqrt(4) + 1 ^2 ⊦ sqrt(4) = 2

User applied rule cut formula

And obtained the following new goals

Proof step 5:
4 = 2 ^2, 0 < 2 * sqrt(4) + 1 ^2, 0 < sqrt(4) ^2 + 2 * sqrt(4) + 1 ^2, sqrt(4) ^2 ≤ 4, 4 < sqrt(4) ^2 + 2 * sqrt(4) + 1 ^2 ⊦ sqrt(4) = 2
Proof step 6:
0 < 2 * sqrt(4) + 1 ^2, 0 < sqrt(4) ^2 + 2 * sqrt(4) + 1 ^2, sqrt(4) ^2 ≤ 4, 4 < sqrt(4) ^2 + 2 * sqrt(4) + 1 ^2 ⊦ 4 = 2 ^2, sqrt(4) = 2

Rule argument

fma: 4 = 2 ^2

Additional information

Used formulas: 4 = 2 ^2