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Step * 1 of Lemma decidable__equal_list


1. [T] : Type
2. ∀x,y:T.  Dec(x = y ∈ T)@i
⊢ Dec([] = [] ∈ (T List))
BY
{ (OrLeft THEN Auto) }

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Latex:

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Latex:

1.  [T]  :  Type
2.  \mforall{}x,y:T.    Dec(x  =  y)@i
\mvdash{}  Dec([]  =  [])


By

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Latex:
(OrLeft  THEN  Auto)

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