Nuprl Lemma : cons_wf_listp 4,23

A:Type, l:A List, x:A. (x.l A List 
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Definitionst  T, b, x:AB(x), A List, ||as||, i<j, ij, P  Q, P  Q, P & Q, P  Q
Lemmasassert of lt int, non neg length, assert wf, lt int wf, length wf1

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