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Step * of Lemma fast-mapfilter_wf

∀[A,B:Type]. ∀[L:A List]. ∀[p:{x:A| (x ∈ L)}  ⟶ 𝔹]. ∀[f:{x:A| (x ∈ L) ∧ (↑p[x])}  ⟶ B].
  (fast-mapfilter(p;f;L) ∈ B List)
BY
{ xxx(xxxxxx(UnivCD THENA Auto)xxxxxx
      THEN RepUR ``fast-mapfilter`` 0
      THEN Using [`A',⌜{x:A| (x ∈ L)} ⌝] MemCD⋅
      THEN Try (Complete (Auto)))xxx }

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Latex:

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Latex:
\mforall{}[A,B:Type].  \mforall{}[L:A  List].  \mforall{}[p:\{x:A|  (x  \mmember{}  L)\}    {}\mrightarrow{}  \mBbbB{}].  \mforall{}[f:\{x:A|  (x  \mmember{}  L)  \mwedge{}  (\muparrow{}p[x])\}    {}\mrightarrow{}  B].
    (fast-mapfilter(p;f;L)  \mmember{}  B  List)


By

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Latex:
xxx(xxxxxx(UnivCD  THENA  Auto)xxxxxx
        THEN  RepUR  ``fast-mapfilter``  0
        THEN  Using  [`A',\mkleeneopen{}\{x:A|  (x  \mmember{}  L)\}  \mkleeneclose{}]  MemCD\mcdot{}
        THEN  Try  (Complete  (Auto)))xxx

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