[tragomaskhalos]

As a maths graduate from nearly 40 years ago I've forgotten far more than I remember, but really enjoy little 10-15 minute snippets of calculus and analysis on YouTube that tickle the rusty old neurons. Current favourite is Michael "and that's a good place to stop" Penn.

[nickcw]

I'm the same as you )other than being a Physics graduate). Love Michael Penn. Interesting topics with a good but not pedantic level of rigor.

https://youtube.com/@MichaelPennMath

[skulk]

I'm a huge fan of Michael Penn's intro to various subfields of math videos, like the one on vertex algebras. He does a great job of balancing definition with motivation so that it doesn't feel like wading through a meaningless sea of symbols.

[viscousviolin]

Forgetting so much is my current fear as well. What did you end up doing?

[steppi]

It hasn’t been nearly so long for me, but I’ve managed to hold on to much of the math I’ve learned by re-proving theorems I’d learned and solving problems in my head during downtime, while doing household chores, and while falling asleep. Another benefit is that I am almost never bored since there’s always more math to do.

[sn9]

Just block off regular times to do the math you want to remember a few times per week at least. Maybe even 30+ minutes per day.

Solve problems. Prove things. Etc.