Frege’s Puzzle on the Santa Monica Beach De Jure Co-reference and the Logical Appraisal of Rational Agents

ABSTRACT In this paper, I argue that a number of influential Millian responses to Frege’s puzzle, which consist in denying that Frege’s data apply to natural languages (and thinking), are not viable if logic is to play its role in legitimizing the logical appraisal of rational subjects. A notion of validity which does justice to the normativity of logic must make room for a distinction between valid inferences and enthymemes. I discuss the prospects of formal, relevant and manifest validity as candidates for a notion which complies with this desideratum. Their success, or failure is argued...