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Proof step 5 from proof square-four (
previous step
)
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
User applied rule insert equation
And closed the goal!
Rule argument
pos: left 1 flags: discard
Additional information
Used simplifier rules: inverse-i: ⊦ sqrt(i ^2) = abs(i);