Step
*
of Lemma
DVp_Null-x_wf
∀[v:C_DVALUEp()]. DVp_Null-x(v) ∈ Unit supposing ↑DVp_Null?(v)
BY
{ DepprodCoDatatypeSelectorWf }
Latex:
\mforall{}[v:C\_DVALUEp()].  DVp\_Null-x(v)  \mmember{}  Unit  supposing  \muparrow{}DVp\_Null?(v)
By
DepprodCoDatatypeSelectorWf
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