Nuprl Lemma : fpf-empty_wf 11,40

A:Type, B:(AType). fpf-empty  fpf(A; x.B(x)) 
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Definitionsx:A. B(x), t  T, fpf(A; a.B(a)), x(s), fpf-empty, P  Q, prop{i:l}, False, P  Q, guard(T), P  Q
Lemmasit wf, unit wf, l member wf, nil member

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