On 10/28/2022 4:38 PM, Bruce Kellett wrote:

On Sat, Oct 29, 2022 at 10:27 AM Brent Meeker <meekerbr...@gmail.com>wrote:On 10/28/2022 3:06 PM, Bruce Kellett wrote:Simply saying that QM as traditionally formulated considers measurement as a special process that os irreversible, doesn't cut it, because measurement is then not treated in terms of the fundamental dynamics of the theory, it is put in in an ad hoc way. Lots of things are put into physics in an ad hoc way. The Born rule is a prime example -- it is just imposed on the quantum wave function in an ad hoc way -- it cannot be derived from the fundamental theory.But by Gleason's theorem it's the only consistent way to put a probability measure on Hilbert space. Who said we need a probability measure?

`Because we observe that the same initial condition results in different`

`later conditions, but with predictable probability distributions.`

That is as ad hoc as anything else; besides, unitary QM does not allowfor a probabilistic interpretation.

`Not if you insist that all evolution is unitary, but that's why Born`

`added the projection postulate to connect the unitary evolution to`

`observation.`

Brent

Bruce --You received this message because you are subscribed to the GoogleGroups "Everything List" group.To unsubscribe from this group and stop receiving emails from it, sendan email to everything-list+unsubscr...@googlegroups.com.To view this discussion on the web visithttps://groups.google.com/d/msgid/everything-list/CAFxXSLTrNUJ%2BiKcTWEAPXNYZ%2B%3DUoziUm5VsMVbE9Q7sx6zA1tg%40mail.gmail.com<https://groups.google.com/d/msgid/everything-list/CAFxXSLTrNUJ%2BiKcTWEAPXNYZ%2B%3DUoziUm5VsMVbE9Q7sx6zA1tg%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 everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/5699d374-422b-70f1-15da-a72e1731cbd0%40gmail.com.