Nuprl Lemma : es-interval_wf2 11,40

es:event_system{i:l}, e,e':es-E(es). [e, e']  ({ev:es-E(es)| loc(ev) = loc(e')  Id}  List) 
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Definitionsx:A. B(x), t  T, prop{i:l}, x. t(x), l_all(L; T; x.P(x)), P  Q, x(s), P  Q, es-le(es; e; e'), P  Q, es-locl(es; e; e'), P  Q
Lemmaslist-set-type2, es-interval wf, Id wf, es-loc wf, es-E wf, event system wf, member-es-interval, l member wf

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