Integer

An integer number is one of the numbers obtained in counting (positive integers also known as natural numbers): $1,2,3,\dots$ , zero: $0$ , or one of the negative integers: $\displaystyle -1,-2,-3,\dots$ . If $\displaystyle{a}$ and $b$ are integers, then so is their sum $a+b$ , their difference $\displaystyle a-b$ , and their product $ab$ , but their quotient $\frac ab$ may or may not be an integer.

The class of integers is the simplest class of numbers and is used to construct other classes like rational numbers and real numbers.

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Integer