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Step * of Lemma gcd_p_neg_arg_a

∀a,b,y:ℤ.  (GCD(a;b;y) ⇒ GCD(-a;b;y))
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1
1. a : ℤ
2. b : ℤ
3. y : ℤ
4. GCD(a;b;y)
⊢ GCD(-a;b;y)

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Latex:

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


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