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Step * 1 1 of Lemma decidable__equal-coordinate_name

.....decidable?..... 
1. x : {2...}@i
2. y : {2...}@i
3. x = y ∈ ℤ
⊢ Dec(x = y ∈ {2...})
BY
{ (OrLeft THEN Auto) }

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Latex:

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Latex:
.....decidable?..... 
1.  x  :  \{2...\}@i
2.  y  :  \{2...\}@i
3.  x  =  y
\mvdash{}  Dec(x  =  y)


By

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Latex:
(OrLeft  THEN  Auto)

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