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Step * of Lemma in-open_wf

∀[X:Type]. ∀[x:X]. ∀[A:Open(X)].  (x ∈ A ∈ ℙ)
BY
{ (Unfold `Open` 0 THEN ProveWfLemma) }

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Latex:

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Latex:
\mforall{}[X:Type].  \mforall{}[x:X].  \mforall{}[A:Open(X)].    (x  \mmember{}  A  \mmember{}  \mBbbP{})


By

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Latex:
(Unfold  `Open`  0  THEN  ProveWfLemma)

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