Nuprl Lemma : f2f+-pred-closed 11,40

es:ES, ff:FIFO, f2f+:F2F+-decls, sndrrcvr:ff.C, ee':E.
(([esndr is_req   rcvr [ercvr is_ack  sndr]) & f2f+-pred(e',e))
 ([e'sndr is_req   rcvr [e'rcvr is_ack  sndr]) 
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Definitionst  T, x:AB(x), is_req  , [ei p j], P  Q, ff.Sender, f(a), s = t, , E, s ~ t, {T}, SQType(T), let x,y = A in B(x;y), t.1, is_ack , P  Q, ff.S, x:A  B(x), P & Q, False, A, left + right, x:AB(x), f2f+-pred(e',e), ES, FIFO, F2F+-decls, ff.C,
Lemmasf2f+Req wf, f2f+Ack wf, f2f+-pred wf, es-E wf, fifoC wf, F2F+-decls wf, FIFO wf, event system wf, f2f+-property, snd-it-of-rcv-it, snd-it wf

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