Abstract

This volume brings together two different, almost disjoint ways of thinking about causation in physics; and that, to my mind, is its special virtue. In describing these two modes of thought it will help to use a conventional philosophical device: a diagrammatic contrast between Kant and Hume. For Kant causality involves order under the universal rule of law. For Hume the concept is intimately connected with our sense that we can make things happen and a projection from that to the presumption that causes in the world outside ourselves similarly make these effects occur. The first point of view has dominated discussions about causality in modern physics throughout the century, both in the general and special theories of relativity and in the various quantum theories. The second has only really entered with the serious discussion of action at a distance in quantum mechanics following the discovery of the Bell inequalities, and that in a piecemeal and not obviously consistent way, for the two traditions sit uneasily together.