Nuprl Lemma : es-when-first 11,40

es:event_system{i:l}, e:es-E(es), x:Id.
(es-first(es; e))  sqequal(es-when(es; x; e); (es_init(es)(loc(e),x,0 + es-time(es; e)))) 
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Definitionsb, t  T, P  Q, x:A. B(x), es-when(es; x; e), event_system{i:l}, es-E(es), Id, es-first(es; e)
Lemmasassert wf, es-first wf, Id wf, es-E wf, event system wf, state-when-first

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