Nuprl Lemma : no_repeats_union 0,22

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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