I've always found linear algebra to be far simpler than any other advanced mathematics. It's basically just a lot of book-keeping and consequences from that. Ye

I've always found linear algebra to be far simpler than any other advanced mathematics. It's basically just a lot of book-keeping and consequences from that. Yet I know smart people who failed it multiple times and had to change majors to avoid it. That makes me pause before dismissing people who complain about it. The article has a better way to assess difficulty, based on how easy it is to teach other how to use it.