27 July 2012
Venue: Room 501 (Pat Hanan Room), Arts 2 (Building 207)
Host: Rachael Briggs from Australian National University
According to David Lewis's Principal Principle, an individual's beliefs about the objective chances should guide her beliefs about chancy matters of fact. According to the equal weight view of peer disagreement, an individual's beliefs about the opinions of her peers should guide her beliefs about the matters of facts that those opinions concern. In both cases, the guidance goes awry when the individual attempts to form opinions about "undermining" propositions, which give her reason to doubt the authority of the relevant guide. I outline the similarities between undermining in the domains of chance and peer disagreement, and delimit the range of possible solutions to undermining problems.