Ask HN: Finding Relevant Math References

Hey everyone, coming back at you with another random question.

What are people’s tricks for recalling math references to relearn “just enough” to solve their current problems?

For example, some background. I took a decent amount of math courses in school (not nearly as much as others in this community) but it was more than 10 years ago and I don’t regularly exercise these muscles. I sometimes know when there are proven mathematical solutions to problems I face, but most of the time hit a wall when trying to recall enough to figure it out again.

A recent example of mine: When the width of a threejs canvas element changes (window is resized) recalculate the camera parameters such that the object in view occupies the full width of the container (more difficult than it sounds!). I hacked it together with some dumb math that barely worked just to move on, but I know intuitively that there is a (relatively) trivial mathematical solution to this problem. Outside of “relearn all fundamentals”, the real solution feels dauntingly far away from what I know right now, but perhaps people have some tricks I can learn from!