Quantum probability from subjective likelihood: Improving on Deutsch's proof of the probability rule

Abstract
I present a proof of the quantum probability rule from decision-theoretic assumptions, in the context of the Everett interpretation. The basic ideas behind the proof are those presented in Deutsch's recent proof of the probability rule, but the proof is simpler and proceeds from weaker decision-theoretic assumptions. This makes it easier to discuss the conceptual ideas involved in the proof, and to show that they are defensible.
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References found in this work BETA
J. Butterfield (1996). Whither the Minds? British Journal for the Philosophy of Science 47 (2):200-221.
David Deutsch (1999). Quantum Theory of Probability and Decisions. Proceedings of the Royal Society of London:3129--37.

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Citations of this work BETA
Meir Hemmo (2007). Quantum Probability and Many Worlds. Studies in History and Philosophy of Science Part B 38 (2):333-350.
Fernando Birman (2009). Quantum Mechanics and the Plight of Physicalism. Journal for General Philosophy of Science 40 (2):207-225.
Guido Bacciagaluppi (2007). Probability, Arrow of Time and Decoherence. Studies in History and Philosophy of Science Part B 38 (2):439-456.
Simon Saunders & D. Wallace (2008). Branching and Uncertainty. British Journal for the Philosophy of Science 59 (3):293-305.

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