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Step * of Lemma bl-exists-map

∀[f,L,P:Top].  ((∃x∈map(f;L).P[x])_b ~ (∃x∈L.P[f x])_b)
BY
{ ((UnivCD THENA Auto) THEN RepUR ``bl-exists`` 0 THEN RWO "reduce-map" 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[f,L,P:Top].    ((\mexists{}x\mmember{}map(f;L).P[x])\_b  \msim{}  (\mexists{}x\mmember{}L.P[f  x])\_b)


By

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Latex:
((UnivCD  THENA  Auto)  THEN  RepUR  ``bl-exists``  0  THEN  RWO  "reduce-map"  0  THEN  Auto)

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