Nuprl Lemma : R-possible_wf 0,22

R:es_realizer{i:l}, es:ES{i}. R-possible{i:l}(Res Prop{i'} 
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Definitionsx:AB(x), t  T, Prop, Possible(R;es), A & B, x:AB(x), P & Q, P  Q
LemmasR-Feasible wf, world wf, fair-fifo wf, possible-world wf, R-Dsys wf, event system wf, w-es wf, es realizer wf

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