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Step * of Lemma square-is-zero

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∀x:ℝ. ((x * x) = r0 ⇐⇒ x = r0)
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1
1. x : ℝ
2. (x * x) = r0
⊢ x = r0

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\mforall{}x:\mBbbR{}.  ((x  *  x)  =  r0  \mLeftarrow{}{}\mRightarrow{}  x  =  r0)


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