On 7/13/2013 1:51 AM, Bruno Marchal wrote:
Irreversibility of first person experience can be recovered from reversible
computation.
That would be statistical irreversibility, i.e. reversal is improbable but not
impossible.
Why? Not necessarily. It can be 100% irreversible from the machine's point of
view.
Indeed some universal machine are reversible (billiard ball, quantum computer,
etc.).
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.
Brent
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