Where did you top out in math classes?
jimbokun: I was required to take two semesters of Statistics as an undergrad.  I didn't think it was especially difficult, but I didn't see applications for the things I was interested in (mainly Computational Linguistics at the time).A few years later, pretty much all Computation Linguistics/Natural Language Processing research revolved around Machine Learning approaches, which is largely Probability and Statistics applied in various ways.  I really kicked myself for not taking Statistics more seriously at the time, and not learning more.I was away from this field for about a decade, but have been working with researchers in this field again in my current job and have been taking classes to catch up.  In addition to Probability and Statistics, I've been learning Linear Algebra as fast as I can and want to take a course on Optimization.So, I suppose the moral of the story is:  you never know when that particular branch of Mathematics that doesn't seem at all relevant to you might suddenly turn out to be very relevant.