On Sun, Dec 1, 2024 at 7:56 PM Alan Grayson <[email protected]> wrote:
> On Friday, November 29, 2024 at 9:57:08 PM UTC-7 Bruce Kellett wrote: > > On Sat, Nov 30, 2024 at 3:37 PM Alan Grayson <[email protected]> wrote: > > On Friday, November 29, 2024 at 6:02:49 PM UTC-7 Bruce Kellett wrote: > > > Non-local does not mean that there are specifiable interactions between > the remote observers. If there were such interactions (FTL , say), then the > theory would involve only local interactions. FTL interactions are just as > local as any other interactions. Non-local means that the system depends on > both x_1 and x_2, when x_1 and x_2 are at different locations (say, > spacelike separated). > > Bruce > > > Isn't spacelike separated a necessary condition for non-local? You write > as if it's one of possibly several necessary conditions. AG > > > No. Spacelike separation is not necessary. You can have a non-local effect > whenever something depends on both x_1 and x_2, when these refer to > separate locations, without any local communication between the points. > Given points A and B, if whatever happens at A cannot affect B, and vice > versa, then the relation between A and B is non-local. The points need not > be spacelike separated. > > Bruce > > > Can you give an example of something depending on two separate locations > where there is no communication between the points? AG > Alice and Bob measuring the spin projections of a pair of entangled particles. The archetypical non-local effect. 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]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/CAFxXSLTEd5Eo7JnaeiqnCCtBxESgsO7pBhqnaAQEgLj6wyj%2Bog%40mail.gmail.com.
