Nuprl Lemma : existse-between2-true 0,22

es:ES, e1:E, e2:{e:E| loc(e) = loc(e1 Id }. e[e1,e2].True  e1  e2  
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Definitionst  T, x:AB(x), e  e' , Prop, True, e[e1,e2].P(e), P  Q, P  Q, b, False, A, loc(e), Id, E, xt(x), P & Q, P  Q, ES, Trans x,y:TE(x;y), A & B, x:AB(x)
Lemmases-le-self, es-le-trans, event system wf, existse-between2 wf, true wf, es-E wf, Id wf, es-loc wf, es-loc-pred, es-le wf

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