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Step * of Lemma union-nat-missing_wf

∀[s1,s2:nat-missing-type()].  (union-nat-missing(s1;s2) ∈ nat-missing-type())
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[s1,s2:nat-missing-type()].    (union-nat-missing(s1;s2)  \mmember{}  nat-missing-type())


By

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Latex:
ProveWfLemma

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