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- Xref: sparky sci.math:17192 sci.physics:21441
- Newsgroups: sci.math,sci.physics
- Path: sparky!uunet!psinntp!scylla!daryl
- From: daryl@oracorp.com (Daryl McCullough)
- Subject: Re: Bayes' theorem and QM
- Message-ID: <1992Dec18.134107.24536@oracorp.com>
- Organization: ORA Corporation
- Date: Fri, 18 Dec 1992 13:41:07 GMT
- Lines: 31
-
- jbaez@riesz.mit.edu (John C. Baez) writes:
-
- >Classical mechanics and quantum mechanics are fundamentally different in
- >that the latter is fundamentally probabilistic. The former is only
- >probabilistic in the sense that computational limitations may prevent us
- >from computing the precise future state that is in principle determined by a
- >given present state.
-
- When you say that quantum mechanics is fundamentally probabilistic, do
- you mean (A) QM is a probabilistic theory with no known deterministic
- completion, or (B) QM is a probabilistic theory that is known *not* to
- have a deterministic completion?
-
- The second statement is unwarranted, in my opinion. Bell's Theorem
- shows that there is no deterministic completion of QM that uses
- classical probability theory. However, Bell's Theorem does *not* say
- that there are no deterministic completions of quantum mechanics, if
- one is willing to give up classical probability theory.
-
- As I have mentioned several times before, there *is* a
- hidden-variables theory for quantum mechanics developed by Pitowsky
- and Gudder. However, the probabilities associated with the hidden
- variables are non-classical; in particular, the measurable sets do not
- form a sigma algebra.
-
- Daryl McCullough
- ORA Corp.
- Ithaca, NY
-
-
-
-