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Step * of Lemma Sierpinski-cases2

∀[x:Sierpinski]. (¬¬((x = ⊤ ∈ Sierpinski) ∨ (x = ⊥ ∈ Sierpinski)))
BY
{ TACTIC:(InstLemma `Sierpinski-cases` [] THEN RepeatFor 2 (ParallelLast') THEN Auto) }

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Latex:

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Latex:
\mforall{}[x:Sierpinski].  (\mneg{}\mneg{}((x  =  \mtop{})  \mvee{}  (x  =  \mbot{})))


By

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

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