Nuprl Lemma : R-and-rule 0,22

AB:es_realizer{i:l}, PQ:(ES{i}Prop{i'}).
A ||-{i} es.P(es B ||-{i} es.Q(es R-compat{i:l}(AB A  B ||-{i} es.P(es) & Q(es
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DefinitionsR ||- es.P(es), left  right, A || B, x:AB(x), R-Feasible(R), x(s), f(a), x:AB(x), ES, Prop, Type, Realizer, Top, x:AB(x), Void, Consistent(R;es), es realizer ind Rplus compseq tag def, P  Q, t  T, P & Q, x:AB(x)
LemmasR-Feasible-Rplus, es realizer wf, event system wf, R-consistent wf, R-Feasible wf, R-compat wf, Rplus wf

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