**Whole Numbers**

Number theory grew out of human curiosity concerning properties of the positive integers 1, 2, 3, 4, 5, . . . , also called whole numbers, *natural numbers*, or *counting numbers*.
These numbers were the first mathematical creation of the human mind; interest in them is as old as civilization itself.
The whole numbers are part of the simplest number system, and is used for counting.
The incorporation of negative numbers (-1, -2, -3, . . . ) leads to the integers.
[**RA**]
{**EB**}

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