This week I ran across Langrange multipliers. I found explanations in both MITOCW and khan. It reminds me of eigenstuff enough to understand them. I see a parallel with Lagrange multipliers. It even reminds me of engineering physics, at least the second time I took it in grad school.

I just finished a training on six sigma and started one on bookkeeping in LinkedIn. I also took one in differential equations. It starts much differently than when I took the subject at Penn State. It also starts with slope fields, sorely lacking in the previous course.