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Step * of Lemma rneq-symmetry

∀x,y:ℝ.  (x ≠ y ⇒ y ≠ x)
BY
{ (Auto THEN D -1 THEN Auto) }

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Latex:

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Latex:
\mforall{}x,y:\mBbbR{}.    (x  \mneq{}  y  {}\mRightarrow{}  y  \mneq{}  x)


By

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Latex:
(Auto  THEN  D  -1  THEN  Auto)

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