Unary operation

In mathematics, a unary operation is an operation with only one operand, i.e. a single input. This is in contrast to binary operations, which use two operands. An example is any function $f : A \to A$ , where $A$ is a set. The function $f$ is a unary operation on $A$ .

Common notations are prefix notation (e.g. ¬, −), postfix notation (e.g. factorial $n!$ ), functional notation (e.g. $sin x$ or $sin(x)$ ), and superscripts (e.g. transpose $A T$ ). Other notations exist as well, for example, in the case of the square root, a horizontal bar extending the square root sign over the argument can indicate the extent of the argument.

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