Nuprl Lemma : compat-iff-common-iseg 11,40

T:Type, l1l2:(T List). l1 || l2  (l:T List. (l1  l & l2  l)) 
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DefinitionsP  Q, P  Q, P  Q, l1 || l2, x:AB(x), P & Q, , l1  l2, x:AB(x), t  T, P  Q
Lemmascommon iseg compat, iseg weakening, iseg wf, compat wf

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