Step 
*
 of Lemma 
pinew-body_wf
∀[v:pi_term()]. pinew-body(v) ∈ pi_term() supposing ↑pinew?(v)
BY
 
{ DepprodCoDatatypeSelectorWf }
 
Latex: 
Latex:
\mforall{}[v:pi\_term()].  pinew-body(v)  \mmember{}  pi\_term()  supposing  \muparrow{}pinew?(v)
 By 
Latex:
DepprodCoDatatypeSelectorWf
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