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Step * of Lemma p-first_wf

∀[A,B:Type]. ∀[L:(A ⟶ (B + Top)) List].  (p-first(L) ∈ A ⟶ (B + Top))
BY
{ (Unfold `p-first` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[A,B:Type].  \mforall{}[L:(A  {}\mrightarrow{}  (B  +  Top))  List].    (p-first(L)  \mmember{}  A  {}\mrightarrow{}  (B  +  Top))


By

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Latex:
(Unfold  `p-first`  0  THEN  Auto)

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