 But as we will shortly see, there are other notions of infinity for which one infinity can lie “beyond” another. In section  3.3,  we will discuss the ideas of infinity that we get from generalizing the use of the natural numbers for counting, rather than generalizing the use of the real numbers for measuring. And in section  3.4,  we will discuss yet another mathematical theory of infinity, which arises from an alternate formulation of calculus, where the \(\epsilon\)’s and \(\delta\)’s are treated as actually being infinitely small, rather than just being arbitrary finite measures of smallness.