Olav Gjelsvik

ABSTRACT This introductory paper raises, partly as a preparation for the other papers in this issue, questions about how philosophy ought to proceed in the light of knowledge we have in surrounding disciplines, with a focus on the case of addiction. It also raises issues about how addiction research might be enlightened by philosophical work. In the background for the paper are two competing approaches to the evidential grounding of philosophical insight. According to a widespread view, philosophical knowledge rests on a set of intuitions. According to another, philosophy has no special evidential grounding. This paper resists the attractions of the first picture, and argues against the separateness of philosophy that it lends support. I try to make plausible that such a picture is harmful both for philosophy and for empirical science. We should replace it with a mild form of unity of science or unity of inquiry, in the spirit of the founder of this journal

This paper analyses and criticizes S. Kripke's celebrated argument against materialist identity?theories. While criticisms of Kripke in the literature attack one or more of his premisses, an attempt is made here to show that Kripke's conclusion is unjustified even if his premisses are accepted. Kripke's premisses have sufficient independent plausibility to make this strategy interesting. Having stated Kripke's argument, it is pointed out that Kripke must assume that the contents of the Cartesian intuitions are clear and of a kind suited for the type of explanation he favours, while his own result concerning contents in epistemic contexts is precisely that this might not be so when objects or events we thought distinct happen to be identical. The point is that only by assuming that the identity?theory is false, can Kripke maintain that the Cartesian intuitions express contents which can be explained in his favoured way. But such an assumption is clearly illegitimate when the aim is to establish that the identity?theory is false. Kripke cannot conclude that the identity?theory is false because no explanation of epistemic possibilities is produced, since by his own standards no such explanation can be produced if the identity?theory is true