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Question on II-A Number theory 2.28(b)

 
 
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Question on II-A Number theory 2.28(b)
by Bober Yang - Saturday, 6 March 2021, 3:32 PM
 

Hi, I am kind of confused about how to start the question using another way. Can someone help me out?

Thanks,

Best, Bober

 
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Re: Question on II-A Number theory 2.28(b)
by Kevin Song - Sunday, 7 March 2021, 9:18 AM
 

Try to prove it the other way around. Start with gcd(a,r) and work towards gcd(b,a).