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Step * of Lemma rneq-cotrans

∀x,y,z:ℝ.  (x ≠ y ⇒ (x ≠ z ∨ y ≠ z))
BY
{ (InstLemma `rneq-cases` [] THEN RepeatFor 2 (ParallelLast') THEN Auto) }

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Latex:

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


By

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Latex:
(InstLemma  `rneq-cases`  []  THEN  RepeatFor  2  (ParallelLast')  THEN  Auto)

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