Unary function

A unary function is a function that takes one argument. A unary operator belongs to a subset of unary functions, in that its range coincides with its domain. A unary function is a function that takes one argument. A unary operator belongs to a subset of unary functions, in that its range coincides with its domain. The successor function, denoted succ {displaystyle operatorname {succ} } , is a unary operator. Its domain and codomain are the natural numbers, its definition is as follows: In many programming languages such as C, executing this operation is denoted by postfixing + + {displaystyle {mathrel {+{+}}}} to the operand, i.e. the use of n + + {displaystyle n{mathrel {+{+}}}} is equivalent to executing the assignment n := succ ⁡ ( n ) {displaystyle n:=operatorname {succ} (n)} . Many of the elementary functions are unary functions, in particular the trigonometric functions, logarithm with a pre-specified base, exponentiation to a pre-specified power or of a pre-specified base, and hyperbolic functions are unary.