Nuprl Lemma : es-interval-less 11,40

es:event_system{i:l}, e,e':es-E(es).
es-locl(esee' ([ee'] = append([e, es-pred(ese')]; cons(e'; []))  (es-E(es) List)) 
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Definitionses-E(es), append(asbs), filter(Pl), t  T, x:AB(x), P  Q, P  Q, P  Q, es-pred(ese), t.1, before(e), es-ble{i:l}(es;e;e'), , [ee'], event_system{i:l}, es-locl(esee'), b, A, b, prop{i:l}, es-first(ese), Unit, False, True, T, tt, P  Q, x(s), xt(x), l_all(LTx.P(x)), P  Q, es-le(esee')
Lemmasassert-es-ble, filter trivial, l all reduce, assert of band, btrue wf, squash wf, true wf, append wf, filter wf, eqtt to assert, iff transitivity, eqff to assert, assert of bnot, es-first wf, bool wf, bnot wf, not wf, assert wf, es-locl wf, event system wf, filter append, es-ble wf, es-before wf, es-pred wf, es-locl-iff, es-E wf

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