Nuprl Lemma : es_val_wf 11,40

es:event_system{i:l}. 
es_val(es e:es-E(es)kindcase(es-kind(ese); a.(es-V(es)(loc(e),a)); l,t.(es-M(es)(l,t))) 
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Definitionst  T, es_info(es), es_val(es), es-M(es), loc(e), es-V(es), es-kind(ese), es-E(es), x:A  B(x), event_system{i:l}, x:AB(x), Type, f(a), kindcase(ka.f(a); l,t.g(l;t)), x:AB(x)
Lemmasevent system wf

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