How to Prove Common Divisors Divide the G.C.D.?

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SUMMARY

The discussion focuses on proving that all common divisors of two integers m and n divide their greatest common divisor (g.c.d). The proof begins with the equation g.c.d = aA + bB, where a and b are integers. It is established that if d is a common divisor, then d divides both a and b. The conversation suggests utilizing the relationship between the g.c.d and least common multiple (lcm) to further explore the proof.

PREREQUISITES
  • Understanding of integer properties and divisibility
  • Familiarity with the concept of greatest common divisor (g.c.d)
  • Knowledge of the least common multiple (lcm)
  • Basic grasp of the Euclidean algorithm
NEXT STEPS
  • Study the Euclidean algorithm for calculating the g.c.d of two integers
  • Learn the relationship between g.c.d and lcm in number theory
  • Explore proofs involving divisibility and common divisors
  • Examine examples of common divisors and their properties
USEFUL FOR

Students studying number theory, mathematicians interested in divisibility, and anyone seeking to understand the properties of the greatest common divisor.

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Homework Statement



Prove that for two integers m,n: all the common divisors divides the g.c.d.(m,n).

Homework Equations





The Attempt at a Solution



g.c.d = aA +bB ; where a, b are the integers

and let d be a common divisor, then:
d|a and d|b.

After this I have no clue where to go.
 
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Do you know the formula for gcd involving lcm? Try using that.
 
u can even try having a look at how gcd of 2 numbers is obtained http://en.wikipedia.org/wiki/Euclidean_algorithm"
 
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