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Step * of Lemma exists_wf

∀[A:Type]. ∀[B:A ⟶ ℙ].  (∃a:A. B[a] ∈ ℙ)
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Latex:

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Latex:
\mforall{}[A:Type].  \mforall{}[B:A  {}\mrightarrow{}  \mBbbP{}].    (\mexists{}a:A.  B[a]  \mmember{}  \mBbbP{})


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