Nuprl Lemma : rtag_wf 11,40

EA:Type, info:(E((:Id  A) + (:(:IdLnk  E Id))), e:E.
(rcv?(e))  (rtag(info;e Id) 
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Definitionsx:AB(x), P  Q, b, rcv?(e), t  T, rtag(info;e), ecase1(e;info;i.f(i);l,e'.g(l;e')), ff, tt, t.2, if b then t else f fi , False,
LemmasIdLnk wf, false wf, true wf, assert wf, rcv? wf, Id wf

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