IRREVERSIBILITY is an artifact of the CI, where collapse occurs to an eigenstate of the observable being measured. But if the measuring apparatus is treated quantum mechanically, all processes associated with measurements are unitary and reversible.
On Saturday, August 13, 2022 at 12:47:06 AM UTC-6 Alan Grayson wrote: > That's defining IRREVERSIBLE FAPP. OTOH, if X and Y produce Z at any > time, I don't see any way to reverse the process, so it's IRREVERSIBLE IN > PRINCIPLE. Do you agree? AG > > On Saturday, August 6, 2022 at 5:02:17 AM UTC-6 johnk...@gmail.com wrote: > >> On Fri, Aug 5, 2022 at 6:47 PM Jesse Mazer <laser...@gmail.com> wrote: >> >> *> But when physicists say that a given system's dynamics are >>> "reversible" doesn't this generally involve an appeal to different initial >>> boundary conditions?* >>> >> >> If at the time of the Big Bang the universe was it in an extremely low >> entropy state then even if the laws of physics were 100% deterministic >> and even if X and Y always produced Z and nothing except X and Y could >> produce Z the second law of thermodynamics would still insist that things >> are irreversible because there are an astronomical number to an >> astronomical power more ways for something to have high entropy than low >> entropy. >> >> John K Clark See what's on my new list at Extropolis >> <https://groups.google.com/g/extropolis> >> 2le >> >> >> -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/d204cad9-caff-415d-ad92-9972a2862b1bn%40googlegroups.com.
