Step 
*
 of Lemma 
face-cube_wf
∀[X:CubicalSet]. ∀[I:Cname List]. ∀[f:I-face(X;I)].  (cube(f) ∈ X(I-[dimension(f)]))
BY
 
{ ProveWfLemma }
 
Latex: 
Latex:
\mforall{}[X:CubicalSet].  \mforall{}[I:Cname  List].  \mforall{}[f:I-face(X;I)].    (cube(f)  \mmember{}  X(I-[dimension(f)]))
 By 
Latex:
ProveWfLemma
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