Nuprl Lemma : implies-es-real 0,22

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

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