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Step * 1 of Lemma gcd_p_neg_arg_a


1. a : ℤ
2. b : ℤ
3. y : ℤ
4. GCD(a;b;y)
⊢ GCD(-a;b;y)
BY
{ (((BackThruLemma `gcd_p_sym` THENM BackThruLemma `gcd_p_neg_arg`) THENM BackThruLemma `gcd_p_sym`) THEN Auto) }

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Latex:

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Latex:

1.  a  :  \mBbbZ{}
2.  b  :  \mBbbZ{}
3.  y  :  \mBbbZ{}
4.  GCD(a;b;y)
\mvdash{}  GCD(-a;b;y)


By

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Latex:
(((BackThruLemma  `gcd\_p\_sym`  THENM  BackThruLemma  `gcd\_p\_neg\_arg`)  THENM  BackThruLemma  `gcd\_p\_sym`)
  THEN  Auto
  )

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