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In this essay, I examine three interrelated issues in the philosophy of mathematics.

The first is an issue in ontology: do mathematical objects exist and, if so, what kind of objects are they? The second is an issue in epistemology: how do we have mathematical knowledge? The third is an issue about the applica­tion of mathematics: how can mathematics be applied to the physical world? These issues are, of course, interconnected, and I explore the relations between them by examining different philosophical conceptions about mathematics.

I start with four versions of Platonism (Fregean Platonism, Godelian Platonism, Quinean Platonism, and structuralist Platonism), and I focus on the different epistemological strategies that have been developed to explain the possibility of math­ematical knowledge. Given that, on these views, mathematical objects exist and are not physically extended, accounts of how we can have know­ledge of these objects are in order. I then consider three alternative nom­inalist approaches (mathematical fictionalism, modal structuralism, and deflationary nominalism), which deny the existence of mathematical objects. With this denial, nominalists owe us, in particular, an explan­ation of the application of mathematics. I then examine their strategies to make sense of this issue, despite the non-existence of mathematical entities. I conclude the essay by bringing together the various issues and the philosophical conceptions.

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Source: Allhoff F.. Philosophies of the Sciences: A Guide. N.-Y.: Wiley-Blackwell,2010. — 386 p.. 2010

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