Nuprl Definition : es-rcvs 0,22

rcvs(l;before(e')) == filter(e.haslnk(l;e);before(e')) 
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clarification:

es-rcvs(esle') == filter(e.es-haslnk(esle);es-before(ese')) 
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Definitionsfilter(P;l), x.A(x), haslnk(l;e), before(e)
FDL editor aliaseses-rcvs

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