Nuprl Lemma : l_contains_nil 11,40

T:Type, L:(T List). []  L 
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Definitionst  T, Type, type List, [], x:AB(x), (x  l), {x:AB(x)} , , a < b, s = t, , ||as||, s ~ t, {T}, P  Q, False, A, A  B, , SQType(T), x:A  B(x), A c B, x:AB(x), x:AB(x), xLP(x), A  B
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