Nuprl Lemma : R-true-rule 0,22

A:es_realizer{i:l}, P:(ES{i}Prop{i'}).
(es:ES{i}. P(es))  R-Feasible{i:l}(A A ||-{i} es.P(es
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Definitionst  T, x:AB(x), ES, Consistent(R;es), f(a), x(s), P  Q, x:AB(x), R-Feasible(R), x:AB(x), P & Q, R ||- es.P(es), Realizer, Type, Prop
LemmasR-Feasible wf, es realizer wf, R-consistent wf, event system wf

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