Step 
*
 of Lemma 
pimp-left_wf
∀[v:formula()]. pimp-left(v) ∈ formula() supposing ↑pimp?(v)
BY
 
{ DepprodCoDatatypeSelectorWf }
 
Latex: 
Latex:
\mforall{}[v:formula()].  pimp-left(v)  \mmember{}  formula()  supposing  \muparrow{}pimp?(v)
 By 
Latex:
DepprodCoDatatypeSelectorWf
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