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Step * 2 1 of Lemma union-eta

.....wf..... 
1. y : Top
⊢ istype(inr y  ~ inl ⊥)
BY
{ (BLemma `istype-inr-sqeq-inl` THEN Auto) }

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Latex:

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Latex:
.....wf..... 
1.  y  :  Top
\mvdash{}  istype(inr  y    \msim{}  inl  \mbot{})


By

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Latex:
(BLemma  `istype-inr-sqeq-inl`  THEN  Auto)

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