Nuprl Lemma : reverse_select_wf 4,23

T:Type, l:T List, n:. n<||l||  reverse_select(l;n)  T 
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Definitionst  T, , x:A. B(x), ||as||, Prop, P  Q, l[i], reverse_select(l;n)
Lemmasselect wf, length wf1, nat wf

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