Nuprl Lemma : rel_star_wf 11,40

T:Type, R:(TTprop{i:l}). rel_star(TR TTprop{i:l} 
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Definitionsx f y, x:AB(x), rel_star(TR), t  T, prop{i:l}, x:AB(x)
Lemmasrel exp wf, nat wf

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