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Theorem 2.4.6: Properties of R and Q

The set of real numbers satisfies the Archimedean Property:
Let a and b be positive real numbers. Then there is a natural number n such that n * a > b

The set of rational numbers satisfies the following Density Property:
Let c < d be real numbers. Then there is a rational number q with c < q < d.

Proof:

It sounds obvious enough, and will be proved later.
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