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Step * of Lemma gcd_p_neg_arg

∀a,b,y:ℤ.  (GCD(a;b;y) ⇒ GCD(a;-b;y))
BY
{ (Unfold `gcd_p` 0 THEN EAuto 1) }

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Latex:

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Latex:
\mforall{}a,b,y:\mBbbZ{}.    (GCD(a;b;y)  {}\mRightarrow{}  GCD(a;-b;y))


By

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Latex:
(Unfold  `gcd\_p`  0  THEN  EAuto  1)

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