# What is a natural number?

Leonid Veselov

August 14, 2012

Definition What is a natural number? This is the number that occurs when counting in a natural way (in the process of listing or calculating).

To determine what is a natural number, there are two approaches:

- The numbers we use when numbering items.

**for example**: the first car, the second car, the third car. - 2. The numbers that we use when we need to denote the number of objects.

**for example**: one kiwi, two kiwis.

All natural numbers make up the set, which is denoted by the sign N.

Now that we know what a natural number is, we can talk to other numbers. In addition to the natural there are also rational, integer, etc.

For example, rational is a number that looks like an irreducible ordinary fraction. This fraction has an integer in the numerator, and the denominator is a natural number.

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