Nuprl Lemma : assoced_equiv_rel 2,24

EquivRel x,y:x ~ y 
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DefinitionsEquivRel x,y:TE(x;y), Symmetrize(x,y.R(x;y);a;b), b | a, x,yt(x;y), P  Q, x:AB(x), t  T, a ~ b
Lemmasdivides wf, divides preorder, symmetrized preorder

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