Nuprl Lemma : gcd_p_neg_arg_2 2,24

aby:. GCD(a;b;y GCD(a;-b;y
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DefinitionsP  Q, P & Q, P  Q, P  Q, GCD(a;b;y), x:AB(x), t  T, T, True, Prop
Lemmasminus minus cancel, true wf, squash wf, gcd p neg arg, gcd p wf

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