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Step * of Lemma open-union_wf

∀[X:Type]. ∀[A:ℕ ⟶ Open(X)].  (open-union(n.A[n]) ∈ Open(X))
BY
{ TACTIC:ProveWfLemma }

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Latex:

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Latex:
\mforall{}[X:Type].  \mforall{}[A:\mBbbN{}  {}\mrightarrow{}  Open(X)].    (open-union(n.A[n])  \mmember{}  Open(X))


By

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Latex:
TACTIC:ProveWfLemma

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