> I don't think there is anything essential about complex numbers when it comes to formulating the laws of QM. Everything can be done without complex numbers b

> I don't think there is anything essential about complex numbers when it comes to formulating the laws of QM. Everything can be done without complex numbers by using matrices. I'm well aware of this (as this is my profession). My other comment, which you already replied to, agrees that there exist representations of QM that do not feature complex numbers. That's besides the point I was making.