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Step * of Lemma mapfilter-wf2

∀[A,B:Type]. ∀[L:A List]. ∀[P:{x:A| (x ∈ L)}  ⟶ 𝔹]. ∀[f:{x:A| (x ∈ L) ∧ (↑(P x))}  ⟶ B].  (mapfilter(f;P;L) ∈ B List)
BY
{ Auto }

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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].
    (mapfilter(f;P;L)  \mmember{}  B  List)


By

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Latex:
Auto

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