Nuprl Lemma : maximal-in-list 0,22

A:Type, f:(A), L:A List. 0<||L||  (aL.xLf(x)f(a)) 
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Definitionsij, Dec(P), P  Q, {T}, P  Q, P  Q, x:AB(x), P & Q, (x  l), xt(x), AB, A, False, (xL.P(x)), xLP(x), P  Q, Prop, ||as||, x:AB(x), t  T
Lemmaslength wf1, le wf, l all wf, l member wf, member singleton, l all nil, l all cons, l exists wf, decidable le, l exists cons, non neg length, length cons

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