On 21 March 2014 05:10, John Clark <johnkcl...@gmail.com> wrote: > Jesse Mazer <laserma...@gmail.com> Wrote: > >> >> > you made a sweeping statement that "If there are 2 different states of >> the universe that could have produced things as they are now then the laws >> of physics are not reversible." >> > > Yes I said that and is one of the most non-controversial things I ever > said. > > >> > This would be true if [...] >> > > There is no "if" about it! What I said was a tautology and like all > tautologies it has the virtue of always being true. >
Sorry, but I disagree about it being both true and a tautology. The statement is only true if the laws of physics working in reverse can't produce *both* the states that could have produced the current state. In the MWI that isn't so, however - the universe branches into all states that can result from the current state, and does so in both time directions, as far as I know (looked at in the normal time direction, a universe branching into the past is equivalent to different branches merging once they become indistinguishable at the quantum level). Quantum alogorithms like Shor's wouldn't work unless this was so, at least that's my understanding of it....? -- 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/d/optout.
