What does simplicial and non simplicial mean in the context of quantum mechanics?
It came up in this thread. The question arose in post #68What do they mean outside quantum mechanics and what makes you think they mean anything within quantum mechanics ?
Another word for simplicial is polytope - it's a shape with pointy points like a square or a triangle. In a classical probabilistic theory, every mixture is a unique mix of pure states. But this is not true for a mixed density matrix, which can be written in many ways as a mixture of pure density matrices.Thanks, but I am having some problems deciphering it. Is there a straightforward defininition?