[dw1]

Advanced calculus, advanced DE's, stats, plus....

And yes, I actually used it. Applications included tensor field analysis, NURBS 3D geometry, flow analysis of non-Newtonian fluids, probability analysis, etc.

I did work in both aerospace and medical research. The most interesting math was analysis of blood flow in arteries and throughout the cardiac cycle in connections with development of mechanical circulatory assist devices, since it is 3D flow of a non-Newtonian fluid (blood) contained in objects with abnormal stress-strain characteristics (arteries & veins). Also, trying to maximizing assisted flow while minimizing hemolysis is a very interesting challenge - interestingly, some of the same technology used by the US Navy to make "silent" submarine propellers is applicable to LVAD impellers. And I used stats (especially DOE, SPC & 6 sigma) in manufacturing.

Oh yeah, and managerial accounting as well, since I was a department head (and senior staff member) and responsible for budgets, cost analyses, ROI calculations, etc.