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Step * of Lemma mapfilter-append

∀[as,bs,P,f:Top].  (mapfilter(f;P;as @ bs) ~ mapfilter(f;P;as) @ mapfilter(f;P;bs))
BY
{ (Auto THEN Unfold `mapfilter` 0 THEN RWW "filter_append_sq map_append_sq" 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[as,bs,P,f:Top].    (mapfilter(f;P;as  @  bs)  \msim{}  mapfilter(f;P;as)  @  mapfilter(f;P;bs))


By

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Latex:
(Auto  THEN  Unfold  `mapfilter`  0  THEN  RWW  "filter\_append\_sq  map\_append\_sq"  0  THEN  Auto)

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