Nuprl Lemma : self_divisor_mul 2,24

a:, b:. ab | a  (b ~ 1) 
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DefinitionsP  Q, b | a, x:A. B(x), t  T, , a ~ b, T, True, P & Q, x:A. B(x), Prop
Lemmasmul cancel in assoced, true wf, squash wf, assoced wf, int nzero wf, divides wf

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