> And surely universality (all-encompassing, there-is-nothing-else) means closed system?
Not necessarily. The question isn't really settled. It seems quite complicated when you get to those scales. E.g. just as an analogy, in general relativity even energy isn't really conserved. (See http://math.ucr.edu/home//baez/physics/Relativity/GR/energy_...) So I don't know whether we can say anything definite about entropy.
Not necessarily. The question isn't really settled. It seems quite complicated when you get to those scales. E.g. just as an analogy, in general relativity even energy isn't really conserved. (See http://math.ucr.edu/home//baez/physics/Relativity/GR/energy_...) So I don't know whether we can say anything definite about entropy.