For instance, there is no natural number which can be added to 3 to get 0 as a result.

It is the natural number after one and before three.

The universe of the model will be the natural numbers.

"God created the natural numbers, all else is the work of man."

For example, consider the natural numbers with addition as the operation.

Using this idea, let us build a special set of natural numbers.

But this is impossible in the set of natural numbers.

Some people say that 0 is a natural number, too.

Examples of natural numbers can be seen in the box on the right.

For example, the natural numbers are 18 and 16 in this relation.