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Step * of Lemma bl-exists-singleton-top

∀[f,a:Top].  ((∃x∈[a].f[x])_b ~ f[a] ∨bff)
BY
{ (RepUR ``bl-exists`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[f,a:Top].    ((\mexists{}x\mmember{}[a].f[x])\_b  \msim{}  f[a]  \mvee{}\msubb{}ff)


By

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Latex:
(RepUR  ``bl-exists``  0  THEN  Auto)

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