Nuprl Lemma : rel_plus_wf 11,40

T:Type, R:(TTType). rel_plus(T; R)  TTType 
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Definitionsx:A. B(x), t  T, rel_plus(T; R), x:A. B(x), x f y, prop{i:l}, subtype(S; T)
Lemmasnat plus wf, rel exp wf, nat plus inc

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