Nuprl Lemma : no_repeats_union 11,40

T:Type, eq:EqDecider(T), as,bs:(T List).
no_repeats(T; as)  no_repeats(T; l-union(eq; as; bs)) 
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Definitionst  T, x:A. B(x), l-union(eq; as; bs), P  Q, no_repeats(T; l), Type, EqDecider(T), type List
Lemmasno repeats wf, deq wf, no repeats-insert, l-union wf

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