Nuprl Lemma : es-interval-is-nil 11,40

es:event_system{i:l}, e,e':es-E(es).
(loc(e) = loc(e' Id)  es-locl(ese'e sqequal([ee']; []) 
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Definitionsevent_system{i:l}, t  T, x:AB(x), es-E(es), loc(e), Id, prop{i:l}, es-locl(esee'), P  Q, [ee'], P  Q, P  Q, P  Q, False
Lemmases-interval wf, es-interval-nil, es-locl wf, Id wf, es-loc wf, es-E wf, event system wf

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