Nuprl Lemma : or_functionality_wrt_implies 13,42

P1P2Q1Q2:. {P1  P2 {Q1  Q2 {(P1  Q1 (P2  Q2)} 
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Upcore 2, core 2
Definitionst  T, P  Q, {T}, P  Q, , x:AB(x)

origin