Nuprl Lemma : existse-between2_functionality_wrt_iff 0,22

es:ES, e1:E, e2:{e:E| loc(e) = loc(e1 Id }, PQ:({e:E| loc(e) = loc(e1 Id }Prop).
(e:{e:E| loc(e) = loc(e1 Id }. P(e Q(e))  (e[e1,e2].P(e e[e1,e2].Q(e)) 
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Definitionst  T, b, P  Q, False, A, x:AB(x), x(s), loc(e), Id, E, P  Q, P & Q, P  Q, A & B, Prop, e  e' , x:AB(x), e[e1,e2].P(e), xt(x), ES
Lemmasevent system wf, iff wf, existse-between2 wf, es-E wf, es-le wf, Id wf, es-loc wf, es-le-loc, es-loc-pred

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