Nuprl Lemma : alle-rcv_wf 0,22

es:ES, l:IdLnk, tg:Id, P:({e:E| isrcv(e) }Prop). (e=rcv(l,tg). P(e))  Prop 
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DefinitionsES, t  T, IdLnk, Id, Prop, x:AB(x), isrcv(e), b, E, x(s), rcv(l,tg), kind(e), Knd, P  Q, e=rcv(l,tg). P(e), True, isrcv(k), {T}, SQType(T)
LemmasKnd sq, Knd wf, es-kind wf, rcv wf, es-E wf, assert wf, es-isrcv wf, Id wf, IdLnk wf, event system wf

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