Nuprl Lemma : sorted-merge 11,40

T:Type. subtype_rel(T; )  (bs,as:(T List). sorted(as)  sorted(merge(as; bs))) 
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Definitionst  T, P  Q, x:A. B(x), sorted(L), merge(as; bs), subtype(S; T)
Lemmassorted wf, s-insert-sorted, merge wf

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