very difficult for entropy to stay constant in a closed system. And surely universality (all-encompassing, there-is-nothing-else) means closed system? Or are we looking at open and closed in the wrong way; if the universe is periodic, could entropy decrease with order 'warping in' from a different point in time (future or past) if time happened to fold or loop over itself to feed into the back of it?
> 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.
