Integer

An integer is a whole number with no fractional part. The set of integers is:

{..., -3, -2, -1, 0, 1, 2, 3, ...}

The set {..., -3, -2, -1} is the set of negative integers.

The set {1, 2, 3, ...} is the set of positive integers.

The set {0, 1, 2, 3, ...} is the set of natural numbers.