Nuprl Lemma : subtype-fpf 0,22

A:Type, P:(AProp), B:(AType). a:{a:AP(a) } fp B(a a:A fp B(a
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Definitionsx:AB(x), A & B, True, T, P  Q, {T}, P  Q, P & Q, False, , AB, ||as||, l[i], P  Q, (x  l), x(s), a:A fp B(a), Prop, S  T, S  T, x:AB(x), t  T
Lemmasl member wf, nil member, cons member, select wf, length wf1

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