# The Real Numbers

• Kenneth R. Davidson
• Allan P. Donsig
Chapter
Part of the Undergraduate Texts in Mathematics book series (UTM)

## Abstract

Doing analysis in a rigorous way starts with understanding the properties of the real numbers. Readers will be familiar, in some sense, with the real numbers from studying calculus. A completely rigorous development of the real numbers requires checking many details. We attempt to justify one definition of the real numbers without carrying out the proofs.

Intuitively, we think of the real numbers as the points on a line stretching off to infinity in both directions. However, to make any sense of this, we must label all the points on this line and determine the relationship between them from different points of view. First, the real numbers form an algebraic object known as a field, meaning that one may add, subtract, and multiply real numbers and divide by nonzero real numbers. There is also an order on the real numbers compatible with these algebraic properties, and this leads to the notion of distance between two points.

## Keywords

Real Number Rational Number Positive Real Number Nonempty Subset Cauchy Sequence
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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