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Step * of Lemma listp-not-nil

∀[A:Type]. ∀[L:A List+].  (¬(L = [] ∈ (A List)))
BY
{ (Unfold `listp` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[A:Type].  \mforall{}[L:A  List\msupplus{}].    (\mneg{}(L  =  []))


By

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Latex:
(Unfold  `listp`  0  THEN  Auto)

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