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Unary operation
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{{short description|Mathematical operation with only one operand}} {{More citations needed|date=March 2010}} In [[mathematics]], a '''unary operation''' is an [[Operation (mathematics)|operation]] with only one [[operand]], i.e. a single input.<ref>{{Cite web|last=Weisstein|first=Eric W.|title=Unary Operation|url=https://mathworld.wolfram.com/UnaryOperation.html|access-date=2020-07-29|website=mathworld.wolfram.com|language=en}}</ref> This is in contrast to ''[[binary operation]]s'', which use two operands.<ref>{{Cite web|last=Weisstein|first=Eric W.|title=Binary Operation|url=https://mathworld.wolfram.com/BinaryOperation.html|access-date=2020-07-29|website=mathworld.wolfram.com|language=en}}</ref> An example is any [[function (mathematics)|function]] {{tmath|f : A \rightarrow A}}, where {{mvar|A}} is a [[Set (mathematics)|set]]; the function {{tmath|f}} is a unary operation on {{mvar|A}}. Common notations are [[prefix notation]] (e.g. [[Β¬]], [[β]]), [[postfix notation]] (e.g. [[factorial]] {{math|''n''!}}), functional notation (e.g. {{math|[[sine|sin]] ''x''}} or {{math|sin(''x'')}}), and [[superscript]]s (e.g. [[transpose]] {{math|''A''{{sup|T}}}}). Other notations exist as well, for example, in the case of the [[square root]], a [[Vinculum (symbol)|horizontal bar]] extending the square root sign over the argument can indicate the extent of the argument.
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