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from Interlude - A Tour of Math
Published online by Cambridge University Press: 13 October 2022
This chapter is the beginning of the interlude, in which we give a tour of various parts of mathematics that are often taken as prerequisites for studying category theory. Here, instead, we will introduce them as examples of categories, in a series of shorter chapters. We begin in this chapter by revisiting some of the structures from the first part of the book and showing how they are all in fact categories. This includes symmetries, equivalence relations, diagrams of factors, and the natural numbers.
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