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Step * of Lemma coW-item_wf

∀[A:𝕌']. ∀[B:A ⟶ Type]. ∀[w:coW(A;a.B[a])]. ∀[b:coW-dom(a.B[a];w)].  (coW-item(w;b) ∈ coW(A;a.B[a]))
BY
{ (ProveWfLemma THEN coWD 3 THEN D 3 THEN Auto) }

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Latex:

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Latex:
\mforall{}[A:\mBbbU{}'].  \mforall{}[B:A  {}\mrightarrow{}  Type].  \mforall{}[w:coW(A;a.B[a])].  \mforall{}[b:coW-dom(a.B[a];w)].
    (coW-item(w;b)  \mmember{}  coW(A;a.B[a]))


By

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Latex:
(ProveWfLemma  THEN  coWD  3  THEN  D  3  THEN  Auto)

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