Step 
*
 of Lemma 
forsome_wf
∀[A:Type]. ∀[B:A ⟶ ℙ].  (∃a.B[a] ∈ ℙ)
BY
 
{ ProveWfLemma⋅ }
 
Latex: 
Latex:
\mforall{}[A:Type].  \mforall{}[B:A  {}\mrightarrow{}  \mBbbP{}].    (\mexists{}a.B[a]  \mmember{}  \mBbbP{})
 By 
Latex:
ProveWfLemma\mcdot{}
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