the_es:ES, e:E. before(e)  {e':E| loc(e') = loc(e)  Id } List 

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Definitions	x:A. B(x), t  T, before(e), P  Q, T, True, Prop, Y, if b t else f fi, true, false, ij, AB, A, False, , SWellFounded(R(x;y)), x:A. B(x), , Unit, P  Q, P & Q,
Lemmas	es-locl-swellfnd, nat wf, es-E wf, event system wf, le wf, es-locl wf, es-first wf, bool wf, eqtt to assert, Id wf, es-loc wf, iff transitivity, assert wf, bnot wf, not wf, eqff to assert, assert of bnot, append wf, nat properties, ge wf, es-pred wf, es-pred-locl, subtype rel list, es-loc-pred