Nuprl Lemma : qoset_refl 13,42

s:QOSet, a:|s|. a  a 
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Upsets 1
Definitionst  T, x:AB(x), Trans(T;x,y.E(x;y)), Refl(T;x,y.E(x;y)), P & Q, Preorder(T;x,y.R(x;y))
Lemmasqoset wf, qoset properties

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