[mkl]

The physics of our brains can in principle be simulated at a subatomic quantum level mathematically, even on a classical computer. It would be absurdly expensive and slow with current technology, but it is mathematically possible. Therefore our own generally intelligent brains can be considered a counterexample.

I think for your theory to hold up, you would need to show that physics cannot, even in principle, be simulated mathematically at sufficient scale (the number of interacting subatomic particles). That would be surprising.

At the moment it seems like your results contradict reality, meaning your starting assumptions cannot all be true.

[al45tair]

And even if OP could show that physics couldn’t be simulated, it still wouldn’t follow that AGI was impossible, or even that it couldn’t be achieved by approximating the simulation that was proved to be impossible to do accurately.

AGI is clearly possible, because our brains are fundamentally machines, and there’s no reason in principle why we couldn’t build something similar. Right now we don’t - as human beings - have the ability to do that, but it clearly isn’t impossible since cellular machinery is able to build it in the first place.