Nuprl Lemma : strong_before_wf 4,23

T:Type, L:T List, xy:Tx << y  L  Prop 
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Definitionst  T, ||as||, P  Q, False, A, AB, , Prop, x:AB(x), l[i], (x  l), P & Q, x << y  l
Lemmasl member wf, nat wf, length wf1, select wf

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