I'm not talking about soul.
I'm just saying you're mistaking the thing for the the tool we use to describe the thing.
I'm also not talking about simulations.
Epistemologically, I'm talking about unknown unknowns. There are things we don't know, and we still don't know we don't know yet. Math and physics deal with known unknowns (we know we don't know) and known knowns (we know we know) only. Math and physics do not address unknown unknowns up until they become known unknowns (we did not tackle quantum up until we discover quantum).
We don't know how humans think. It is a known unknown, tackled by many sciences, but so far, incomplete in its description. We think we have a good description, but we don't know how good it is.
If a human body is intelligent, and we could in principle set up a computer-simulated universe which has a human body in it and simulate it forward with sufficient accuracy to make the body operate as a real-world human body has, we would have an artificial general intelligence simulated by a computer (i.e using mathematics).
If you think there are potential flaws in this line of reasoning other than the ones I already covered, I'm interested to hear.
We currently can't simulate the universe. Not only in capability, but also knowledge. For example, we don't know where or when life started. Can't "simulate forward" from an event we don't understand.
Also, a simulation is not the thing. It's a simulation of the thing. See? The same issue. You're mistaking the thing for the tool we use to simulate the thing.
You could argue that the universe _is_ a simulation, or computational in nature. But that's speculation, not very different epistemologically from saying that a magic wizard made everything.
Of course we can't simulate the universe (or, well, a slice of a universe which obeys the same laws as ours) right now, but we're discussing whether it's possible in principle or not.
I don't understand what fundamental difference you see between a thing governed by a set of mathematical laws and an implementation of a simulation which follows the same mathematical laws. Why would intelligence be possible in the former but fundamentally impossible in the latter, aside from precision limitations?
FWIW, nothing I've said assumes that the universe is a simulation, and I don't personally believe it is.
> a thing governed by a set of mathematical laws
Again, you're mistaking the thing for the tool we use to describe the thing.
> aside from precision limitations
It's not only about precision. There are things we don't know.
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I think the universe always obeys rules for everything, but it's an educated guess. There could be rules we don't yet understand and are outside of what mathematics and physics can know. Again, there are many things we don't know. "We'll get there" is only good enough when we get there.
The difference is subtle. I require proof, you seem to be ok with not having it.