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Assuming more simulated universes will exist than real ones, with no other information it's more likely we are in one of the simulated ones.
This seems to imply machinery to effect the simulation beyond the scope of the "Universe" being simulated. Where exactly is this machinery if not in the Universe?
Assuming it is technologically possible to simulate a universe, or at least a portion of a universe; the closer we are to the advent of that tech, the more likely we are in a simulated universe.
The "root" universe itself may be described as a set of computations similar to that of a digital universe, regardless of whether it is simulated within another "child" universe.
We might observe a behavior that doesn't apply to the real universe and is just a simulation error of our universe. This can make the "real" universe far less complex than we observe ours.
Smart city is future
How do we determine that the Universe is a simulation, within the Universe itself?
since some believe it is a simulation then that means it cant be one because it would probably be designed for the people living in it not to know that it is a simulation
There exists an isomorphism between the laws of physics and a sufficiently complex formal calculus; that is, the laws of physics are computable.
The theory of a simulation undetectable by science is discouraged by the Ockham's razor principle. The principle basically states that among competing hypotheses, the one with the fewest assumptions should be selected. I linked a source to understand the principle better.
A computer running such a simulation can't have infinite memory.
In our universe, there are irrational numbers like pi, which contain infinite information (they go on forever without any pattern). To show that the universe is a simulation, one needs to show that irrational numers are finite.
It's impossible to tell from the inside if a universe is a simulation or a "real" one.