Abstract

The goal of this paper is to reconstruct Nagel’s approach to idealization in the sciences and present his views as a viable option. In a nutshell, the theory that emerges can be described as follows: There are various types of idealization, which can be found in theoretical and experimental laws, and which, according to Nagel, play various important epistemic roles. In particular, they help organize complex knowledge and allow for approximations to truth. A cognate of idealization, which Nagel does not refer to under this label but describes in terms of assimilation to the familiar and in terms of analogy, is key to scientific models, whose value is primarily heuristic in nature. The fact that theories involve idealization supports an instrumentalist perspective on science, a perspective which also determines a particular scope of the account of idealization. By these lights, particular types of questions simply do not arise, for instance: questions pertaining to the alleged peculiarity of scientific representation, the truth of law statements, etc.