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Step * 1 1 1 of Lemma arrow_pair_lemma


1. y : Top
2. x : Top
⊢ y ~ y
BY
{ Try SqEqCD }

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Latex:

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Latex:

1.  y  :  Top
2.  x  :  Top
\mvdash{}  y  \msim{}  y


By

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Latex:
Try  SqEqCD

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