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Step * of Lemma length_wf

∀[A:Type]. ∀[l:A List].  (||l|| ∈ ℤ)
BY
{ ProveWfLemma }

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Latex:

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


By

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Latex:
ProveWfLemma

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