Nuprl Lemma : es-le-self 11,40

es:event_system{i:l}, e:es-E(es). es-le(es; e; e) 
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Definitionst  T, x:A. B(x), es-locl(es; e; e'), guard(T), P  Q, event_system{i:l}, es-E(es), es-le(es; e; e')
Lemmases-E wf, event system wf, es-locl wf

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