# Tag Info

Accepted

• 214

### Does each vector in $su(3)$ represent a different kind/type of gluon (infinite kinds/types of gluons); or, are they all considered the same kind/type?

There are two "levels" of charge in gauge theories. There is the representation, which is a vector space, and then there is a vector in that space. The vectors within a representation are ...
• 19.2k
Accepted

### On the separability definition of mixed states

As suggested, I put here as an answer. The idea is that if the goal is to check for separability, there is no loss of generality since by spectral decomposition any density matrix $\rho^{(i)}_A$ (...
• 1,518