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Step * of Lemma mapfilter-singleton

∀[x,P,f:Top].  (mapfilter(f;P;[x]) ~ map(f;if P x then [x] else [] fi ))
BY
{ (RepUR ``mapfilter`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[x,P,f:Top].    (mapfilter(f;P;[x])  \msim{}  map(f;if  P  x  then  [x]  else  []  fi  ))


By

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Latex:
(RepUR  ``mapfilter``  0  THEN  Auto)

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