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Step * of Lemma filter-cons

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

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Latex:

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


By

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Latex:
(Reduce  0  THEN  Auto)

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