Nuprl Lemma : decidable__existse-between1 0,22

es:ES, e1e2:E, P:({e:E| loc(e) = loc(e1 Id }Prop).
loc(e2) = loc(e1 Id  e@loc(e1). Dec(P(e))  Dec(e[e1,e2).P(e)) 
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Definitionsx:AB(x), Prop, P  Q, x(s), e[e1,e2).P(e), t  T, xt(x), Dec(P), x:AB(x), A & B, P & Q, P  Q, {T}, A, (e <loc e'), P  Q, False
Lemmasalle-at wf, decidable wf, es-E wf, Id wf, es-loc wf, event system wf, not wf, es-le wf, es-locl wf, es-le-loc, es-loc-pred, es-locl-iff

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