GCD of ab,c = 1: Implications for a & b

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SUMMARY

The discussion centers on the mathematical property that if gcd(ab, c) = 1, then it follows that gcd(a, c) = 1 and gcd(b, c) = 1. The participants explore the implications of this property, using the equation abk + cl = 1 to derive further insights. The conversation highlights the logical steps needed to prove the individual gcd conditions for a and b with respect to c, emphasizing the interconnectedness of these relationships.

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  • Understanding of the greatest common divisor (gcd) concept
  • Familiarity with integer linear combinations
  • Basic knowledge of number theory
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  • Study the properties of gcd and their proofs in number theory
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Mathematicians, students studying number theory, and anyone interested in the properties of gcd and their applications in mathematical proofs.

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Homework Statement


If gcd(ab,c) = 1 then gcd(a,c)=1 and gcd(b,c)=1


2. The attempt at a solution
Well, if gcd(ab,c) = 1 we know that

abk + cl = 1 for some integers k and l

not really sure where to go from here... any hints?
 
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Also, if gcd(a,c)=1, then am+cn=1 for some integers m and n. Now what if m=bk?

Repeat for the other one.
 
oh wow, that is painfully obvious ... thanks Char. Limit !
 

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