He's wrong that frequentism does not empirically support probability
statements. He goes off on a tangent by referring to "other gamblers".
Nothing in physics is certain, yet Deutsch takes a bunch of definite
assertions and claims they alone are the real physics.
"The race is not always to the swift, nor the battle to the strong, but
that's the way to bet."
--- Damon Runyan
"In the Austin airport on the way to this meeting I noticed for sale
the October issue of a magazine called Astronomy, having on the cover the
headline “Why You Live in Multiple Universes.” Inside I found a report of
a discussion at a conference at Stanford, at which Martin Rees said that
he was sufficiently confident about the multiverse to bet his dog’s life on
it, while Andrei Linde said he would bet his own life. As for me, I have
just enough confidence about the multiverse to bet the lives of both Andrei
Linde and Martin Rees’s dog."
--- Steven Weinberg
Brent
On 11/20/2022 4:28 PM, Bruce Kellett wrote:
On Mon, Nov 21, 2022 at 2:52 AM smitra <[email protected]> wrote:
Probability cannot be a fundamental concept in physics as explained
here:
https://www.youtube.com/watch?v=wfzSE4Hoxbc
I'm afraid Deutsch is a bit too glib in this lecture. He hasn't,
despite his best efforts, removed probability from physics. For
example, in quantum mechanics, he has not explained why, if one
measures the z-spin of a spin-half particle prepared in an eigenstate
of x-spin, one gets only one result -- either z-spin-up or
z-spin-down. If one has eliminated probability, one should be able to
explain which result one gets, and why. It is no solution to say that
with many-worlds, that both results are obtained by disjoint copies of
the experimenter. The experimenter is just one copy, and one would
have to explain the result for each individual separately. Many worlds
does not explain why I, for example, see only z-spin-up and not
z-spin-down. To make sense of that, we need a viable concept of
probability and the Born rule.
Bruce
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