Step
*
of Lemma
RankEx4_Foo?_wf
∀[v:RankEx4()]. (RankEx4_Foo?(v) ∈ 𝔹)
BY
{ DepprodCoDatatypeRecognizerWf }
Latex:
\mforall{}[v:RankEx4()].  (RankEx4\_Foo?(v)  \mmember{}  \mBbbB{})
By
DepprodCoDatatypeRecognizerWf
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