Hi, I think some background is necessary: I'm a Psychology undergraduate student. I also really love math. I've incorporated some pure math into my studies - next semester I'll have room for a course on "Foundational Mathematics" (I'm not sure if that's exactly what they call it outside my country but it's basically logic, set theory, and some extra topics), and hopefully will be accepted into the rigorous calculus course sequence they offer to students in the hard sciences rather than the hand-wavy stuff they give to everyone else. I think I'm preparing well for these courses - I've been learning set theory from a book and from these forums (thanks, micromass :) ) and I've started going through Spivak's Calculus to prepare for the calculus sequence. That is going quite well. However, I would love to learn non linear dynamics or chaos theory as well - I'm planning to interdisciplinary graduate work and feel that knowing something about this branch of math would be a bonus - but I have no idea what the prerequisites are, what books are considered standard/very good, etc. Mostly, I'd like to know more about which math courses you guys think I should take before a non-linear dynamics course, but also, because my studies are so far removed from the hard sciences, if there are any other relevant courses I should take before this kind of course - for instance courses that are foundational for science students but I may not have taken. Thanks in advance! I'd very much appreciate any advice. Dods.