© 1998 by British Society for the Philosophy of Science
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Chance, Credence, and the Principal Principle
Department of Philosophy, University of Nottingham Nottingham NG7 2RD, UK
Any adequate theory of chance must accommodate some version of David Lewis's Principal Principle, and Lewis has argued forcibly that believers in primitive propensities have a problem in explaining what makes the Principle true. But Lewis can only derive (a revised version of) the Principle from his own Humean theory by putting constraints on inductive rationality which cannot be given a Humean rationale.