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Step * of Lemma pos_length3

∀[A:Type]. ∀[l:A List].  uiff(¬↑null(l);||l|| ≥ 1 )
BY
{ (InstLemma `pos_length2` []⋅ THEN RepeatFor 3 (ParallelLast) THEN Auto) }

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Latex:

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Latex:
\mforall{}[A:Type].  \mforall{}[l:A  List].    uiff(\mneg{}\muparrow{}null(l);||l||  \mgeq{}  1  )


By

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Latex:
(InstLemma  `pos\_length2`  []\mcdot{}  THEN  RepeatFor  3  (ParallelLast)  THEN  Auto)

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