Mathsy people try very hard to like mathematics documentaries. They will frequently claim that they like them. But they don’t, really, not often, not much. For non-maths people it is much simpler: they don’t like maths documentaries and, if not so intimidated as to hold their tongues, they are generally happy to say so.
The sad reality is that most mathematics documentaries are bad. They are bad art, and they make for bad education.* This was brought to mind by a new Netflix documentary, A Trip to Infinity, and by a recent invitation. The invitation I’ll get to later. The documentary is bad.