A formal proof of the Born rule from decision-theoretic assumptions

摘要: I develop the decision-theoretic approach to quantum probability, originally proposed by David Deutsch, into a mathematically rigorous proof of Born rule in (Everett-interpreted) mechanics. sketch argument informally, then prove it formally, and lastly consider number ``counter-examples'' show exactly which premises they violate. (This is preliminary version chapter appear --- under title ``How Rule'' Saunders, Barrett, Kent Wallace, "Many worlds? Everett, theory reality", forthcoming from Oxford University Press.)