Nuprl Lemma : assert_functionality_wrt_bimplies 12,41

u, v:. ((u  v))  {(u)  (v)} 
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DefinitionsTrue, t  T, tt, ff, if b then t else f fi , b, p q, {T}, p  q, b, P  Q, x:A. B(x), False, Unit, , ,
Lemmasbool wf, false wf, true wf

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