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Step * of Lemma filter-singleton

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

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Latex:

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


By

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

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