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Step * of Lemma gcd_assoc

∀a,b,c:ℤ.  (gcd(gcd(a;b);c) ~ gcd(a;gcd(b;c)))
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1. a : ℤ
2. b : ℤ
3. c : ℤ
⊢ gcd(gcd(a;b);c) ~ gcd(a;gcd(b;c))

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Latex:

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Latex:
\mforall{}a,b,c:\mBbbZ{}.    (gcd(gcd(a;b);c)  \msim{}  gcd(a;gcd(b;c)))


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