Integers
An integer is a whole number.
By definition, it is both rational and real.
It can be positive, negative or zero - the only constraint is that it cannot have a fractional part (e.g. it can’t be a decimal or fraction).
Notation
Section titled “Notation”The set of integers is usually denoted by the symbol
Examples of integers
Section titled “Examples of integers”Non-examples of integers
Section titled “Non-examples of integers”(has a fractional part - the decimal .14) (has a fractional part - the decimal .5) (has a fractional part) (irrational so not whole) (irrational so not whole) (not a real number)