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Step * of Lemma pos_length2

∀[A:Type]. ∀[l:A List].  uiff(¬↑null(l);0 < ||l||)
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Latex:
\mforall{}[A:Type].  \mforall{}[l:A  List].    uiff(\mneg{}\muparrow{}null(l);0  <  ||l||)


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