In other words, without a broader nominalization strategy, which allows set theory itself to be nominalized, it seems difficult to see how mathematical fictionalists can use metalogical results as part of their program. The problem, however, is that it is not at all obvious that, at least in the form articulated by Field, the mathematical fictionalist program can be extended to set theory. For it only provides a nominalization strategy for scientific theories, that is, for the use of mathematics in science (e.g., in Newtonian gravitational theory). The approach doesn't address the nominalization of mathematics itself.