I mean no disrespect, but I hope your son grows up wise enough to not be worried about the skin colour of the people who invented each aspect of mathematics.

I hope instead he learns, perhaps with the help of his father, that people of all colours have made huge contributions to the things civilisation depends on, and that life isn't a team sport where we're only allowed to cheer for the people whose skin is the same colour as ours.

I also think curricula should be accurate. But I don't think they should waste time on irrelevancies. If your son's teachers are telling him that white people invented mathematics (which I don't believe they are), this is inaccurate. I'm completely with you on calling that inaccuracy out.

But if they simply aren't breaking down each contribution to maths by skin colour, I think that's exactly as it should be. I hope we one day feel no more tempted to highlight people's skin colour, when it's not relevant, than we do their eye colour.