Nuprl Lemma : possible-world-monotonic 11,40

AB:Dsys. A  B  (w:World. PossibleWorld(B;w PossibleWorld(A;w)) 
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Definitionst  T, x:AB(x), P  Q, D1  D2
LemmasId wf, ma-ds-sub, d-m wf, ma-ds wf, w-vartype wf, subtype rel transitivity

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