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Step * of Lemma ss-open-or_wf

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∀[X:SeparationSpace]. ∀[T:Type]. ∀[F:T ⟶ Open(X)].  (⋃x:T.F[x] ∈ Open(X))
BY
{ ProveWfLemma }

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Latex:

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Latex:
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\mforall{}[X:SeparationSpace].  \mforall{}[T:Type].  \mforall{}[F:T  {}\mrightarrow{}  Open(X)].    (\mcup{}x:T.F[x]  \mmember{}  Open(X))


By

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Latex:
ProveWfLemma

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