On Page 2 of Baby Rudin contain proof of $\sqrt {2}$ is not rational Number .I understand that .But Below that above content is written.How to obtain that relation between p and q I don't understand .Please Help me .
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Curious student
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What's the question? Why he chooses $q$ like that? Or how to get from (3) to (4)? – Hans Lundmark May 01 '18 at 11:40
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1Actually how to obtain that relation ? I do not wanted to memorize above.If you tell any concrete way to obtain above that would be helpful for me. – Curious student May 01 '18 at 11:42