David Wolpert "Slams Door" on Laplace's Demon

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SUMMARY

David Wolpert's 2008 work employs Cantor diagonalization to challenge the concept of Laplace's demon, which posits that complete knowledge of a system's initial conditions allows for the prediction of its future states. Wolpert demonstrates that within any universe, there are quantities that cannot be determined by any inference device operating within that universe. This effectively undermines Laplace's assertion that a hypothetical "demon" could predict the future if it had complete information about all particles.

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Dragonfall
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On the Wikipedia page about http://en.wikipedia.org/wiki/Laplace%27s_demon" , it says

"In 2008, David Wolpert used Cantor diagonalization to "slam the door" on Laplace's demon."

I'm not sure what that means.
 
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Apparently (and I hope the physicists will weigh in on this) it means:

"Wolpert proves that in any [...] system of universes, quantities exist that cannot be ascertained by any inference device inside the system. Thus, the “demon” hypothesized by Pierre-Simon Laplace in the early 1800s (give the demon the exact positions and velocities of every particle in the universe, and it will compute the future state of the universe) is stymied if the demon must be a part of the universe."

http://jonesthought.wordpress.com/category/mathematics/
 

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