Nuprl Lemma : possible-event_wf 0,22

poss:(ES{i}Prop{i'}). possible-event{i:l}(poss)  Prop{i'} 
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DefinitionsType, Prop, t  T, ES, x:AB(x), f(a), x:A. B(x), E, x:AB(x), PossibleEvent(poss)
Lemmases-E wf, event system wf

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