Published online by Cambridge University Press: 01 April 2022
I invoke the conceptual machinery of contemporary possible-world semantics to provide an account of the metaphysical status of “bridge laws” in intertheoretic reductions. I argue that although bridge laws are not definitions, and although they do not necessarily reflect attribute-identities, they are supervenient. I.e., they are true in all possible worlds in which the reducing theory is true.
I am grateful to Robert Causey, Alvin Goldman, Jaegwon Kim, Lawrence Sklar, and the referees of this journal for helpful comments on various ancestors of this paper.