Nuprl Lemma : decidable__l_all 4,23

A:Type, F:(AProp), L:A List. (k:A. Dec(F(k)))  Dec(kLF(k)) 
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Definitionst  T, Prop, x(s), x:AB(x), Dec(P), xLP(x), P  Q, xt(x), A, P  Q, P & Q, P  Q, P  Q
Lemmasdecidable cand, decidable functionality, l all cons, not wf, l all wf, l all nil, decidable wf

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