> What's the reason for the simulation to be smaller than the simulator? Depends on what "smaller" means: - if "smaller" means "not able to contain as much in

> What's the reason for the simulation to be smaller than the simulator? Depends on what "smaller" means: - if "smaller" means "not able to contain as much information" then yes, the simulation has to be smaller or equal to the universe containing the simulation. You can't store N bits in N-1 bits in general (a simple counting argument can prove that). - if "smaller" refers to a concept of physical dimension, then it's possible to simulate bigger universes, as long as it's a lower resolution simulation.