From a skim, I'd summarize the paper thus: "product of (exponentiated) Paulis can be shown to have 2 eigenvalues" (& Let anyone who disagrees try to argue tha

From a skim, I'd summarize the paper thus: "product of (exponentiated) Paulis can be shown to have 2 eigenvalues" (& Let anyone who disagrees try to argue that quaternions aren't the best way to think about classical rotation)