Nuprl Lemma : implies_functionality_wrt_iff 9,38

P1,P2,Q1,Q2:. (P1  P2 (Q1  Q2 {(P1  Q1 (P2  Q2)} 
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ProofTree


Definitionst  T, P  Q, P  Q, {T}, P  Q, P  Q, , x:AB(x)
Lemmasiff wf

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