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Step * of Lemma member-exists

∀[T:Type]. ∀L:T List. (∃x:T. (x ∈ L) ⇐⇒ ¬(L = [] ∈ (T List)))
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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}L:T  List.  (\mexists{}x:T.  (x  \mmember{}  L)  \mLeftarrow{}{}\mRightarrow{}  \mneg{}(L  =  []))


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