The difference is that a simulation is an approximation of a copy. Simulation
code has to be complex because we want to preserve those features that are
important, which is never a straightforward problem.
An exact simulation of the universe down to the last particle would be a very
simple
This is a question I have barely thought about at all - but since AI and
science build so many simulations of parts of the world, and philosophers
like Bostrom talk conceptually so much about similar simulations - it seems
worth thinking about.
What's the difference between a computer
