Nuprl Lemma : l_all_iff 0,22

T:Type, L:T List, P:(TProp). (xLP(x))  (i:||L||. P(L[i])) 
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DefinitionsxLP(x), (x  l), P  Q, P  Q, x:AB(x), A & B, , x(s), l[i], x:AB(x), {i..j}, i  j < k, AB, P & Q, A, False, P  Q, ||as||, Prop, t  T
Lemmasselect wf, length wf1, int seg wf, nat wf, le wf

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