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Step * of Lemma length_wf_nat

∀[A:Type]. ∀[L:A List].  (||L|| ∈ ℕ)
BY
{ (Auto' THEN MemTypeCD THEN Auto THEN BLemma `non_neg_length` THEN Auto) }

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Latex:

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Latex:
\mforall{}[A:Type].  \mforall{}[L:A  List].    (||L||  \mmember{}  \mBbbN{})


By

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Latex:
(Auto'  THEN  MemTypeCD  THEN  Auto  THEN  BLemma  `non\_neg\_length`  THEN  Auto)

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