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Step * of Lemma member_null

∀[T:Type]. ∀[L:T List]. ∀[x:T].  ¬↑null(L) supposing (x ∈ L)
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Latex:
\mforall{}[T:Type].  \mforall{}[L:T  List].  \mforall{}[x:T].    \mneg{}\muparrow{}null(L)  supposing  (x  \mmember{}  L)


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