Nuprl Lemma : normal-es-dt 0,22

da:k:Knd fp Type, l:IdLnk. Normal(da Normal(dt(l;da)) 
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Definitionst  T, x:AB(x), rcv(l,tg), P & Q, P  Q, b, xdom(f). v=f(x  P(x;v), Normal(T), Normal(da), x:AB(x), Knd, Type, f(x), AtomFree(T;x), Void, x:AB(x), Top, x:AB(x), P  Q, Id, dt(l;da), x.A(x), xt(x), a:A fp B(a), IdDeq, x  dom(f), Normal(ds), IdLnk
Lemmasnormal-da wf, IdLnk wf, fpf wf, Knd wf, assert wf, fpf-dom wf, id-deq wf, fpf-trivial-subtype-top, es-dt wf, Id wf, es-dt-dom, es-dt-ap, rcv wf

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