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Unfortunately I have reached the maximum number of math classes I can take for my undergraduate degree. I still wish to study basic ODEs and basic number theory. What is a good textbook with an introduction to these? I would prefer a textbook that is not super rigorous or formal since I will be studying it on my own time.
Thank you.

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    Similar questions: books on ODE/PDE http://math.stackexchange.com/q/3335/8232011-04-21
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    Books on introductory number theory: http://math.stackexchange.com/q/1774/8232011-04-21
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    Wiki-hammered. For future reference: I highly encourage users of this site to be proactive in flagging this type of questions to the moderator for conversion to community wiki.2011-04-21
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    @Willie: I have a question for you, I wanted to know what is a community wiki and what is the difference between that and a normal thread? Thanks2011-04-21
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    @nightowl: please see http://meta.math.stackexchange.com/questions/445/what-questions-should-be-community-wiki2011-04-21
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    @Willie: Thanks for that info.2011-04-22

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