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Step * 1 of Lemma square-is-one

.....assertion..... 
∀x:ℝ. (x^2 = r1^2 ⇐⇒ (x = r1) ∨ (x = -(r1)))
BY
{ (RWO "squares-req" 0 THEN Auto) }

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Latex:

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Latex:
.....assertion..... 
\mforall{}x:\mBbbR{}.  (x\^{}2  =  r1\^{}2  \mLeftarrow{}{}\mRightarrow{}  (x  =  r1)  \mvee{}  (x  =  -(r1)))


By

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Latex:
(RWO  "squares-req"  0  THEN  Auto)

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