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Step * of Lemma open-isect_wf

∀[X:Type]. ∀[A,B:Open(X)].  (open-isect(A;B) ∈ Open(X))
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[X:Type].  \mforall{}[A,B:Open(X)].    (open-isect(A;B)  \mmember{}  Open(X))


By

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Latex:
ProveWfLemma

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