Unary operation

Common card · No. 361375

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 → A {\displaystyle f:A\rightarrow A} ⁠, where A is a set; the function ⁠ f {\displaystyle f} ⁠ is a unary operation on A. Common notations are prefix notation (e.g. negation ¬, additive inverse −), postfix notation (e.g. factorial n!), functional notation (e.g. sin x or sin(x)), and superscripts (e.g. transpose AT). 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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