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Step * of Lemma one_or_both_wf

∀[A,B:Type].  (one_or_both(A;B) ∈ Type)
BY
{ Unfold `one_or_both` 0 THEN Auto }

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Latex:

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Latex:
\mforall{}[A,B:Type].    (one\_or\_both(A;B)  \mmember{}  Type)


By

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Latex:
Unfold  `one\_or\_both`  0  THEN  Auto

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