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Step * of Lemma lambda-wf

∀[A,B:Type]. ∀[f:A ⟶ B].  (λx.f[x] ∈ A ⟶ B)
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Latex:

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Latex:
\mforall{}[A,B:Type].  \mforall{}[f:A  {}\mrightarrow{}  B].    (\mlambda{}x.f[x]  \mmember{}  A  {}\mrightarrow{}  B)


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Latex:
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