3: Proof Techniques
- Page ID
- 23248
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- 3.5: The Euclidean Algorithm
- One of the most important concepts in elementary number theory is that of the greatest common divisor of two integers. Let a and b be integers, not both 0. A common divisor of a and b is any nonzero integer that divides both a and b . The largest natural number that divides both a and b is called the greatest common divisor of a and b .