On 13 Jul 2013, at 21:06, meekerdb wrote:

## Advertising

On 7/13/2013 1:51 AM, Bruno Marchal wrote:Irreversibility of first person experience can be recovered fromreversible computation.That would be statistical irreversibility, i.e. reversal isimprobable but not impossible.Why? Not necessarily. It can be 100% irreversible from themachine's point of view.Indeed some universal machine are reversible (billiard ball,quantum computer, etc.).But isn't there a distinction between reversible and irreversiblecomputations? 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 memoryis what cost energy in computation, but "erasing memory" can besimulated by dissociation or discarding information. Quantumcomputations are both Turing universal and reversible, like the SWE.Yes, I know. But since you propose that a world is a kind of bundleover threads of computations, it seems that having irreversiblecomputations in that thread would imply the world is irreversible.Yet all the fundamental physics models are reversible.

`That would mean that among the universal dovetailing in arithmetic,`

`the reversible computations win the "measure competition", or that the`

`first person plural emerging on that universal dovetailing is governed`

`by some Turing Universal group. The last case is encouraged by the`

`material "hypostases", but it is too early to decide. Having`

`irreversible computations in the base ontology does not necessarily`

`implies that the physical laws are irreversible, because the physical`

`itself is an emerging pattern from the first (plural) points of view,`

`which abstracts itself from the delays in the universal dovetailing.`

Bruno http://iridia.ulb.ac.be/~marchal/ -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.