Nuprl Lemma : crossed-pair_wf 11,40

es:ES, ff:FIFO, is_reqis_ack:(E), sndrrcvr:ff.C, ra:E.
crossed-pair{i:l}(es;ff;is_req;is_ack;sndr;rcvr;r;a  
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DefinitionsA c B, x:AB(x), P & Q, crossed-pair{i:l}(es;ff;is_req;is_ack;sndr;rcvr;r;a), t  T, , x:AB(x)
Lemmasevent system wf, FIFO wf, fifoC wf, es-E wf, es-causl wf, fifoSender wf, fifoR wf, fifoS wf

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