Nuprl Lemma : es-frame_wf 0,22

es:ES, i:Id, L:Knd List, x:Id, T:Type. es-frame(es;i;L;x;T Prop 
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Definitionst  T, {T}, P  Q, x:AB(x), SQType(T), Id, Prop, vartype(i;x), x when e, (x after e), ES, Knd, loc(e), E, kind(e), (x  l), A, xt(x), e@iP(e), A & B, es-frame(es;i;L;x;T)
Lemmases-vartype wf, alle-at wf, not wf, l member wf, es-kind wf, es-E wf, es-loc wf, Knd wf, event system wf, es-after wf, es-when wf, Id wf, Id sq

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