Step 
*
 of Lemma 
bl-exists-nil
∀[f:Top]. ((∃x∈[].f[x])_b ~ ff)
BY
 
{ (RepUR ``bl-exists`` 0 THEN Auto) }
 
Latex: 
Latex:
\mforall{}[f:Top].  ((\mexists{}x\mmember{}[].f[x])\_b  \msim{}  ff)
 By 
Latex:
(RepUR  ``bl-exists``  0  THEN  Auto)
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