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Step * of Lemma first-member_wf

∀[T:Type]. ∀[P:T ⟶ 𝔹]. ∀[L:T List]. ∀[x:T].  (first-member(T;x;L;P) ∈ ℙ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[P:T  {}\mrightarrow{}  \mBbbB{}].  \mforall{}[L:T  List].  \mforall{}[x:T].    (first-member(T;x;L;P)  \mmember{}  \mBbbP{})


By

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Latex:
ProveWfLemma

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