 In response to the identification problem, it seems attractive to combine a structuralist approach with Field’s nominalism. This leads to versions of nominalist structuralism, which can be outlined as follows. Let us focus on mathematical analysis. The nominalist structuralist denies that any concrete physical system is the unique intended interpretation of analysis. All concrete physical systems that satisfy the basic principles of Real Analysis (RA) would do equally well. So the content of a sentence \(\phi\) of the language of analysis is (roughly) given by: