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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)
YangBober - 2021年03月6日 Saturday 15:32
 

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)
SongKevin - 2021年03月7日 Sunday 09:18
 

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

 
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