Nuprl Lemma : nil_member 11,40

T:Type, x:T. (x  [])  False 
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Definitionsprop{i:l}, t  T, A, A  B, P  Q, P  Q, P  Q, A c B, x:AB(x), False, (x  l), P  Q, x:AB(x), Y, ||as||,
Lemmasfalse wf, select wf, length wf2, nat wf

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