Nuprl Lemma : l_all_wf 11,40

T:Type, L:(T List), P:({x:T| (x  L)} prop{i:l}). l_all(L; T; x.P(x))  prop{i:l} 
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DefinitionsP  Q, x(s), l_all(L; T; x.P(x)), t  T, prop{i:l}, x:A. B(x)
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