On 7/13/2013 1:51 AM, Bruno Marchal wrote:
Irreversibility of first person experience can be recovered from reversible 

That would be statistical irreversibility, i.e. reversal is improbable but not 

Why? Not necessarily. It can be 100% irreversible from the machine's point of 

Indeed some universal machine are reversible (billiard ball, quantum computer, 

But isn't there a distinction between reversible and irreversible computations? Doesn't the UD do both of them?

Yes. The main difference is that irreversible computation needs "energy" (can be virtual), and reversible does not. Erasing memory is what cost energy in computation, but "erasing memory" can be simulated by dissociation or discarding information. Quantum computations are both Turing universal and reversible, like the SWE.

Yes, I know. But since you propose that a world is a kind of bundle over threads of computations, it seems that having irreversible computations in that thread would imply the world is irreversible. Yet all the fundamental physics models are reversible.


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