Nuprl Lemma : compat-iseg2 11,40

T:Type, L1L2L3:(T List). L1  L2  L3 || L2  L3 || L1 
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Definitionst  T, P  Q, P & Q, P  Q, x:AB(x), l1 || l2, l1  l2
Lemmascompat wf, iseg wf, compat-iseg, compat symmetry

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