Since the publication of Elga's seminal paper in 2000, the Sleeping Beauty paradox has been the source of much discussion, particularly in this journal. Over the past few decades the Everettian interpretation of quantum mechanics1 has also been much debated. There is an interesting connection between the way these two topics raise issues about subjective probability assignments.

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This connection is often alluded to, but as far as we know Peter J. Lewis's ‘Quantum Sleeping Beauty’ (2007a) is the first attempt to examine it explicitly. Lewis claims that the two debates are not independent: to be specific, he argues that accepting the Everettian interpretation of quantum mechanics requires you to be a ‘halfer’ about Sleeping Beauty, in opposition to the more widely accepted ‘thirder’ solution.

This...

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