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Step * of Lemma b-union_wf

∀[A,B:Type].  (A ⋃ B ∈ Type)
BY
{ (Unfold `b-union` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[A,B:Type].    (A  \mcup{}  B  \mmember{}  Type)


By

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Latex:
(Unfold  `b-union`  0  THEN  Auto)

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