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Step * 2 of Lemma presheaf-type-cumulativity

.....eq aux..... 
1. C : SmallCategory
2. X : ps_context{j:l}(C)
⊢ istype({X ⊢ _})
BY
{ (Unfold `presheaf-type` 0 THEN Auto) }

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Latex:

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Latex:
.....eq  aux..... 
1.  C  :  SmallCategory
2.  X  :  ps\_context\{j:l\}(C)
\mvdash{}  istype(\{X  \mvdash{}  \_\})


By

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Latex:
(Unfold  `presheaf-type`  0  THEN  Auto)

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