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Binary relations

In this chapter we study examples involving the classical sets of number, namely the sets $ \mathbb{N}$ (natural numbers), $ \vert Z$ (integres), $ \mathbb{Q}$ (rational numbers) and $ \mathbb{R}$ (real numbers). We rely on their intuitive knowledge; precise definitions for $ \mathbb{N}$, $ \mathbb{Z}$ and $ \mathbb{Q}$ will be given in Chapter 6. For $ \mathbb{R}$, this task is beyond the scope of these notes.


root 2002-06-10