NOMIC DEPENDENCE AND CAUSATION

The paper proposes an explication of causation in terms of laws and their explanatory systematization. A basic notion is "nomic dependence". The definition given by David Lewis is suitable for deterministic laws, and a general definition drawing on Wesley Salmon's statistical-relevance model of explanation is proposed. A test is offered for establishing that one chain of nomically dependent events is more direct than another that ends with the same event by considering the relationship between the two chains when an explanation in terms of more basic laws is sought. The chain to an event can be defined as causal if it is the most direct nomically linked chain leading up to that event.