rational number

One may assume that the rational numbers are contained in the field.

In fact, this particular interpretation is often used to define the rational numbers.

Therefore the square root of 2 cannot be a rational number.

A simple example is the set of non-zero rational numbers.

The same sign rules apply to rational and real numbers.

F is a field of characteristic 0, usually the rational numbers.

Therefore every positive rational number appears exactly once in this tree.

There is a Ford circle associated with every rational number.

In this way, we produce an infinite list with all the rational numbers.

The choice (the field of rational numbers) and is suitable.