A unary operator belongs to a subset of unary functions, in that its codomain coincides with its domain.
In contrast, a unary function's domain need not coincide with its range.
The successor function, denoted
Its domain and codomain are the natural numbers; its definition is as follows: In some programming languages such as C, executing this operation is denoted by postfixing ++ to the operand, i.e. the use of n++ is equivalent to executing the assignment
This mathematics-related article is a stub.