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If you are really interested in the math involved you can look at any algorithms book. I used this one in my undergrad: http://www.amazon.com/Algorithm-Design-Jon-Kleinberg/dp/0321...

Its a good introduction, but it will require you to be decent at math and know how to do proofs.

On the other hand, if you are interested in how programs can express things, then maybe you want to learn about some CS theory. Specifically, some lambda calculus would be good to learn, but I don't have any good suggestions.

Note: All of these will be easier to read if you are pretty good at programming, so I'd say follow at least the first piece of advise above.

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