Nuprl Lemma : es-msg_wf2 11,40

the_es:ES, l:IdLnk, e:{e:E| haslnk(l;e)} . emsg(e (Msg on l
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Definitionsx:AB(x), t  T, (Msg on l), haslink(l;m), mlnk(m), emsg(e), msg(l;t;v), t.1, P  Q, A c B, P  Q, P & Q, , Msg, Msg(M)
Lemmasassert-es-haslnk, es-msg wf, es-E wf, assert wf, es-haslnk wf, IdLnk wf, event system wf

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