For the past 5 months I've been taking a break from electronics and revisiting my roots in mathematics. In particular, Ive been studying differential equations starting from my undergrad level to as much information as I can find. I know computers can solve many of these DEs, but Ive been learning how to solve each type by hand.
I've known DEs for 15 years, but never really went in depth like I wanted. The numerical methods in particular are of great interest.
Interestingly, MIT now puts many classes online. So any of us can attend MIT as if sitting in the classroom.
One thing to note, just watching the videos doesnt do much, you MUST also do the homeworks they provide to prove you know the material.
Of course a good test of understanding is to try to interpret the theory of relativity, which is a set of DEs.
I still need to do my review for my Pi3. it didnt work at first but I got it up and running, will know that out next week!