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Step * of Lemma ss-open-and_wf

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∀[X:SeparationSpace]. ∀[A,B:Open(X)].  (A ⋂ B ∈ Open(X))
BY
{ ProveWfLemma }

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Latex:

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Latex:
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\mforall{}[X:SeparationSpace].  \mforall{}[A,B:Open(X)].    (A  \mcap{}  B  \mmember{}  Open(X))


By

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Latex:
ProveWfLemma

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