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Step * of Lemma face-direction_wf

∀[X:CubicalSet]. ∀[I:Cname List]. ∀[f:I-face(X;I)].  (direction(f) ∈ ℕ2)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[X:CubicalSet].  \mforall{}[I:Cname  List].  \mforall{}[f:I-face(X;I)].    (direction(f)  \mmember{}  \mBbbN{}2)


By

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Latex:
ProveWfLemma

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