I thought theory of computation was a really hard area for me to think about. But I haven't taken that many math classes. I'd like to take more classes like that though--classes that cause me to warp my mind. What areas did you guys find to be the most difficult?
closed as not constructive by William, MJD, Pete L. Clark, Old John, Marc van Leeuwen Sep 10 '12 at 9:00
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It is not a question anyone can answer for you.
Look at this list of math courses, and look into each one and decide what floats your boat.