Step
*
of Lemma
gcd_p_sym
∀a,b,y:ℤ.  (GCD(a;b;y) 
⇒ GCD(b;a;y))
BY
{ (Unfold `gcd_p` 0 THEN Auto) }
Latex:
Latex:
\mforall{}a,b,y:\mBbbZ{}.    (GCD(a;b;y)  {}\mRightarrow{}  GCD(b;a;y))
By
Latex:
(Unfold  `gcd\_p`  0  THEN  Auto)
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