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Step * of Lemma l_contains_wf

∀[T:Type]. ∀[A,B:T List].  (A ⊆ B ∈ ℙ)
BY
{ (Unfold `l_contains` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[A,B:T  List].    (A  \msubseteq{}  B  \mmember{}  \mBbbP{})


By

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Latex:
(Unfold  `l\_contains`  0  THEN  Auto)

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