Abstract

1. Brian Hedden, in this impressively learned and ingenious, if somewhat maddening book,1 1 defends a view he calls Time-slice Rationality, a view comprising two central claims. They are: Synchronicity : All requirements of rationality are synchronic. Impartiality : In determining how you rationally ought to be at a time, your beliefs about what attitudes you have at other times play the same role as your beliefs about what attitudes other people have.