Nuprl Lemma : nil_member-variant 11,40

TA:Type, x:T. (A T ((x  [])  False) 
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ProofTree


Definitionst  T, P  Q, False, A, A  B, , {x:AB(x)} , , x:AB(x), x:AB(x), Void, x:A  B(x), A c B, x:AB(x), #$n, ||as||, a < b, type List, [], l[i], s = t, Type, , P  Q, P & Q, P  Q, (x  l)
Lemmasnat wf, length wf2, select wf, false wf

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