Nuprl Lemma : l_contains_append 11,40

T:Type, AB:(T List). A  A @ B 
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DefinitionsA  B, xLP(x), xt(x), {T}, P  Q, P & Q, P  Q, as @ bs, , P  Q, P  Q, (x  l), x:AB(x), t  T
Lemmasl member wf, append wf, member append, implies functionality wrt iff, all functionality wrt iff

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