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Step * 1 of Lemma sub-presheaf-set-true

.....wf..... 
1. C : SmallCategory
2. X : ps_context{j:l}(C)
3. ∀[C:small-category{[i | j]':l}]. ∀[F:presheaf{[i | j]':l}(C)].  ext-equal-presheaves(C;F|True;F)
⊢ X ∈ presheaf{[i | j]':l}(C)
BY
{ ((Unfold `presheaf` 0 THEN Fold `ps_context` 0) THEN Auto) }

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Latex:

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Latex:
.....wf..... 
1.  C  :  SmallCategory
2.  X  :  ps\_context\{j:l\}(C)
3.  \mforall{}[C:small-category\{[i  |  j]':l\}].  \mforall{}[F:presheaf\{[i  |  j]':l\}(C)].    ext-equal-presheaves(C;F|True;F)
\mvdash{}  X  \mmember{}  presheaf\{[i  |  j]':l\}(C)


By

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Latex:
((Unfold  `presheaf`  0  THEN  Fold  `ps\_context`  0)  THEN  Auto)

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