Abstract

Structural realists have made use of category theory in three ways. The first is as a meta-level formal framework for a structural realist account of the structure of scientific theories, either syntactic or semantic. The second is an appeal to the category-theoretic structure of some successful, successive or fundamental, physical theory to argue that this is the structure we should be physically committed to, either epistemically or ontically. The third is to use category theory as a conceptual tool to argue that it makes conceptual sense to talk of relations without relata and structures without objects. After a brief overview of structural realism, I consider how each appeal to the use of category theory stands up against the aims of the structural realist.

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