> On 2 Feb 2021, at 12:22, Bruce Kellett <[email protected]> wrote: > > On Tue, Feb 2, 2021 at 10:09 PM Bruno Marchal <[email protected] > <mailto:[email protected]>> wrote: >> On 31 Jan 2021, at 06:48, Alan Grayson <[email protected] >> <mailto:[email protected]>> wrote: >> >> When a particle hits the screen in a double slit experiment, is that a >> measurement? AG > > You can say that it is a measurement from the screen point of view. But as > screen have no re-accessible memory, it is better to define the measurement > relatively to some machine with Memory, like Everett. > > > Of course the screen has a memory -- it creates a permanent record of where > the particle hit, and that can be accessed as many times as required.
The screen has a memory, and it is indeed accessible, but it is not re-accessible by the screen itself, as it ha no self-referential ability. All the problems you see come from your confusion between a first person and a third person description, as you illustrated here. It is obvious that with the MWI there is no indeterminacy and probability at all, but for the superposed individual, you get the usual first person indeterminacy which enforces the use of some probability or credibility measure on the set of personal future. Bruno > > Bruce > > -- > 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 [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/everything-list/CAFxXSLTp%2BS9u%2B9sN5BUisye24L4Wt8%3D6RLuEoX8p08Fv8NY1EA%40mail.gmail.com > > <https://groups.google.com/d/msgid/everything-list/CAFxXSLTp%2BS9u%2B9sN5BUisye24L4Wt8%3D6RLuEoX8p08Fv8NY1EA%40mail.gmail.com?utm_medium=email&utm_source=footer>. -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/5762120F-AB1D-4481-9846-D95E54A9F889%40ulb.ac.be.
