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Step * of Lemma member-implies-null-eq-bfalse

∀[T:Type]. ∀[L:T List]. ∀[x:T].  null(L) = ff supposing (x ∈ L)
BY
{ (Auto THEN FLemma `member_null` [-1] THEN Auto) }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[L:T  List].  \mforall{}[x:T].    null(L)  =  ff  supposing  (x  \mmember{}  L)


By

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Latex:
(Auto  THEN  FLemma  `member\_null`  [-1]  THEN  Auto)

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