I guess the highest math classes that I took were Ama 95 and Complex Analysis,and an introductory abstract algebra class (cannot remember the course codes at the moment). Ama95 was an introduction to applied mathematics and included weekly challenging problems out of the book on partial differential equations by Carrier and Pearson. We did a lot of exercises related to Schrödinger`s wave equation. I remember doing well on the Final exam, but then the grade on my report card was a B or C, so I had to ask the professor what was going on, so he double checked, and I guess he had made a mistake in entering my grade which was actually an A-. A lesson in standing up for yourself. It was a really hard class (go ahead! ask other Caltech undergrads about their experiences in Ama 95!). I am proud of myself for that A- I also did a bit of C programming (although I had done this already in high school and in summer jobs in San Diego), and one of the really intresting combo math/physics classes included computorial physics where we did things likeimplement a spreadsheet to solve the gravitational differential equation using real solar system data and plotting voyager`s path to jupiter. We also used mathematica for some problems, and I remember trying to implement a neural networks homework problem using mathematica, but failing to get it to work, and being frustrated, but the professor was really cool and gave me an A for effort. Perhaps the most notable thing that happened to me at Caltech, perhaps, happened while I was still a high school student (from San Diego) and was studying at a Caltech`s high school summer physics seminar for several weeks. One day, I got to attend a lecture by Richard Feynman and got to ask 3 questions. The one I remember the most was (since I had never heard of Feynman before this moment) what he did to earn the Nobel Prize. His answer felt a bit rude, because it was something like, to answer that question so that you would understand the answer, I would first have to give you 3 years of graduate level physics. Anyway, this was in the summer of 1987, and he died the next year, so I was lucky to have met him. I was a freshman in 1988. I took a year off to live with my Dad in 1991-92 and attended Westminster College in Pennsylvania while I stayed with him, taking a few interesting computer science classes, including intro to databases and an x86 based assembly language programming class with our own simple x86 test boards to use in the class for lab assignments. I went back the following year to Caltech and the last class I had to finish to graduate was a combo EE/CS class where we had to implement a basic keyboard which included a button with an oscillating electrical signal without any base drivers or pre-existing software. At least some (if not all) of the code had to be written in assembly... it has been many years since that time, so I don`t remember for certain. ©