- 148

- 2

So I guess the state of a particle is some combination of the above two pieces of information, along with possibly some additional information? If S1 is the space in which F lives and S2 is the 2D spin space, how do we combine them to form a larger space representing the entire state. Tensor product, Cartesian product, ...? Is there any other information we need to include in the state (along with the spin and position density)? If not, how do we know there's nothing else to include? Some rationale that says the behavior of a particle is determined only by these pieces of information?

Thanks