Step * 1 of Lemma concat-single


1. Top List
⊢ [] l
BY
(RWO "append-nil" THEN Auto) }


Latex:


Latex:

1.  l  :  Top  List
\mvdash{}  l  @  []  \msim{}  l


By


Latex:
(RWO  "append-nil"  0  THEN  Auto)




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