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skippyfishlast Sunday at 4:48 PM3 repliesview on HN

> Godel's incompleteness theorem or the halting problem are applicable to everything including the human brain.

Maybe. That's if you assume that the universe is a conventional computer. Far from settled and the alternative isn't necessarily just "God does it" - it might be that the universe is a "computer-plus", with some processes that produce results not computable by Turing means. It would be strange, but so is quantum mechanics, so...


Replies

seanhunteryesterday at 9:43 AM

This line of thinking doesn’t really go anywhere. You can say “but what if <something outside of an axiomatic system>? Then <axiomatic system> doesn’t apply!”

Well great. Then where are you? You are precisely nowhere. You haven’t disproved the results in the system and you haven’t proved anything else.

hardbasslast Sunday at 7:08 PM

As of yet we have no such evidence of physical systems that are more powerful than Turing machines. We will consider if ever such evidence arises.

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pegasuslast Sunday at 5:16 PM

Yep, a possibility that has found support with Roger Penrose, who wrote two books about it.