The general consensus among mathematical philosophers (or philosophical mathematicians, for that matter) is that mathematics is *a priori* – independent of experience. However, a flourishing contemporary branch within the philosophy of mathematics is that of *structuralism*, which I will explain in detail in a little bit. Advocates of the structuralist approach are e.g. Shapiro [1] and Resnik [2], who argue how this approach answers a lot of important philosophical questions, including Resnik’s way of answering how mathematics can have applications in the physical world. There is a catch however: he assumes that mathematics is *a posteriori* – dependent of experience – contrary to popular belief.

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