Still, I'm in doubt that a significant proportion of us would have the discipline for this. One reason why some things are pretty much only learned in university is that they provide the necessary motivation.
I collect interesting problems and learn the math that can solve them. I do best by directly connecting fun and learning.
I've been very interested in this method for a while. How do you find the math that would solve them? Is it well-understood, or is it easy to figure out in practice? Would love to hear more about how this looks for you practically.
You may enjoy signal processing in the context of submarines.