Step * 1 of Lemma nil_wf


1. Type
⊢ [] ∈ colist(T)
BY
(Unfold `nil` THEN colistD THEN BUnionLeft THEN Auto) }


Latex:


Latex:

1.  T  :  Type
\mvdash{}  []  \mmember{}  colist(T)


By


Latex:
(Unfold  `nil`  0  THEN  colistD  0  THEN  BUnionLeft  THEN  Auto)




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