I moved out of a large city to continue working as an engineer for the same company remotely during the pandemic. In general it is much safer and less dense being out of the city, and much more greenspace and nature. I very much prefer it.
For analysis you absolutely MUST read Principles of Mathematical Analysis by Walter Rudin. Covers everything and is literally a gold standard text in modern analysis. "Baby Rudin" is essentially the analysis bible that all subsequent texts worked off of.
I heard a bunch of students complain about how tough the text for our Real Analysis class was, so I was surprised to find it felt pretty readable to me. Turns out it was a new prof that semester who decided to go with "Mathematical Analysis, Second Edition by Tom Apostol" instead of Baby Rudin.
Point being, there may be a better analysis text for this student to start with right now- depends highly on their background/situation, but personally I am glad I didn't have to read Rudin for my first "real" math course.
On the other hand though, could you say that someone's interests are to a degree dictated by their capabilities? It seems to me like the distinguishing factor between someone who is interested in a challenging field vs. someone who is not, is that the person interested often understands the material to a degree that maybe the other person is unable to. For them studying and doing the work may take substantially less effort and thus their interest continues, even when things become difficult.
This is probably why many programmers are uninterested in your chosen field of teaching.
TLDR, isn't "disinterest" often a cognitive bias driven by some subconscious estimation that we're unable to do something?
Yes, and! Things are often less black and white than this. The more I dig into what I think I want, the more influences I find. I want to impress my parents, I want to provide a super safe and comfortable life for my partner, I want people to notice the company I work for and smile and think I'm smart. As I take the time to pull those things apart, and wow does it take time, the call to teach and write is quieter but maybe truer? I don't know. I have to test it out.
TL;DR I think disinterest is driven by a combination of capability and soul AND (sometimes very loud) outside influences.
