DefinitionIntegers are a set of whole numbers which may contain positive, negative, or no integer. These are labeled by Z and are the number systems used in an immense amount of math, such as algebra, number theory, and combinatorics. We can add, subtract and multiply integers, but we cannot divide. The dots are frequently used in theoretical mathematics, as a means to count and to order, and they are accordingly used as an example of a reserved character in applied mathematics. Example: Integer Set −...,−3,−2,−1,0,1,2,3,....