Nuprl Lemma : es-tag_wf 0,22

the_es:ES, e:E. isrcv(e)  tag(e)  Id 
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DefinitionsES, E, isrcv(e), tag(e), kind(e), tag(k), P  Q, b, isrcv(k), x:A. B(x), t  T
Lemmasisrcv wf, assert wf, tagof wf, event system wf

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