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Step * of Lemma f-subset_wf

∀[T:Type]. ∀[eq:EqDecider(T)]. ∀[xs,ys:fset(T)].  (xs ⊆ ys ∈ ℙ)
BY
{ (Unfold `f-subset` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[eq:EqDecider(T)].  \mforall{}[xs,ys:fset(T)].    (xs  \msubseteq{}  ys  \mmember{}  \mBbbP{})


By

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Latex:
(Unfold  `f-subset`  0  THEN  Auto)

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