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Step * 1 1 1 1 of Lemma firstn_is_iseg


1. T : Type
2. l : T List
⊢ [] = firstn(0;l) ∈ (T List)
BY
{ ((Symmetry THEN BackThruLemma `length_zero`) THEN Auto) }

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Latex:

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Latex:

1.  T  :  Type
2.  l  :  T  List
\mvdash{}  []  =  firstn(0;l)


By

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Latex:
((Symmetry  THEN  BackThruLemma  `length\_zero`)  THEN  Auto)

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