Nuprl Lemma : es_time_wf 11,40

es:event_system{i:l}. es_time(es es-E(es)rationals 
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Definitionst  T, es_time(es), es-E(es), x:A  B(x), event_system{i:l}, x:AB(x), rationals, x:AB(x)
Lemmasevent system wf

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