Step 
*
 of Lemma 
es-E-interface_wf
∀[Info:Type]. ∀[es:EO+(Info)]. ∀[X:EClass(Top)].  (E(X) ∈ Type)
BY
 
{ ProveWfLemma }
 
Latex: 
\mforall{}[Info:Type].  \mforall{}[es:EO+(Info)].  \mforall{}[X:EClass(Top)].    (E(X)  \mmember{}  Type)
 By 
ProveWfLemma
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