Nuprl Lemma : R-sub-Rall 11,40

T:Type, L:(T List), R:({x:T| (x  L)} Realizer), x:T. (x  L)  R(x)  xL.R(x) 
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DefinitionsxL. P(x), S  T, , P & Q, x:A. B(x), t  T, xL.R(x), x(s), P  Q, x:A. B(x), {T}, P  Q, P  Q
Lemmasl member set, member map, es realizer wf, map wf, R-sub-Rlist, l member wf, list-subtype

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