Nuprl Lemma : assoc_reln 11,40

a,b:. (divides(ab divides(ba))  pm_equal(ab
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Definitionsprop{i:l}, t  T, P  Q, P  Q, P  Q, P  Q, x:AB(x), x:AB(x), divides(ba), P  Q, pm_equal(ij)
Lemmaspm equal wf, divides wf, divides anti sym

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