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OK, I got interested in this enough to write up a formal note.

Comments welcome.

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http://hanson.gmu.edu/bornrule.pdf or .ps

Quantum Probability From Decision Theory and Exchangeability

by Robin Hanson, July 27, 2001.

Deutsch's derivation of quantum probability from decision theory has been

criticized as relying on an implausible hidden assumption. I here offer as

a substitute an apparently more plausible exchangeability assumption.

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Robin Hanson rhanson@gmu.edu http://hanson.gmu.edu

Asst. Prof. Economics, George Mason University

MSN 1D3, Carow Hall, Fairfax VA 22030-4444

703-993-2326 FAX: 703-993-2323

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