Filip Buekens

Contextualists and assessment relativists neglect the expressive dimension of assertoric discourse that seems to give rise to faultless disagreement. Discourse that generates the intuition makes public an attitudinal conflict, and the affective -expressive dimension of the contributing utterances accounts for it. The FD-phenomenon is an effect of a public dispute generated by a sequence of expressing opposite attitudes towards a salient object or state of affairs, where the protagonists are making an attempt to persuade the other side into joining the other’s camp.

Most attempts at defining or elucidating ’weak’ or ’strong’ supervenience introduce various forms of _physical indiscernibility_. After glancing at some definitions, I argue that they must fail if mental events are supposed to be genuinely causally efficacious and non-epiphenomenal. Then I elucidate Davidson’s account of supervenience (’D-supervenience’), first as an abstract relation between a predicate and a set of predicates (to be illustrated by uncontroversial examples), and then as applied to the mental/physical relation. I argue that Davidson must defend that if two events are physically indiscernible in the light of a complete physical theory of the world then they must be identical in the Leibnizian sense (‘L-identity’): physical indiscernibility collapses into L-identity. It follows that mental differences between two numerically different events logically entail physical differences between them. I conclude by demonstrating how the Davidsonian account of the concept can explain some counterexamples to Moore’s approach to supervenience of moral on natural properties. The central tenet in this paper is that supervenience principles based on duplication create, rather than solve, problems in this problem area.