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Step * of Lemma square-nonzero

∀x:ℝ. (x * x ≠ r0 ⇐⇒ x ≠ r0)
BY
{ (EAuto 1 THEN RWO "rmul-nonzero" (-1) THEN Auto) }

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Latex:

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


By

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Latex:
(EAuto  1  THEN  RWO  "rmul-nonzero"  (-1)  THEN  Auto)

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