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Step * of Lemma filter_trivial2

∀[T:Type]. ∀[P:T ⟶ 𝔹]. ∀[L:T List].  filter(P;L) = L ∈ (T List) supposing (∀x∈L.↑P[x])
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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[P:T  {}\mrightarrow{}  \mBbbB{}].  \mforall{}[L:T  List].    filter(P;L)  =  L  supposing  (\mforall{}x\mmember{}L.\muparrow{}P[x])


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