Unary Operation ○꠹ Entries

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Unary Operation ○꠹｜Definition｜1st｜20251119205401-00-⌔

Unary operation - Wikipedia

Unary operation

In mathematics, a unary operation is an operation with only one operand, i.e. a single input.¹ This is in contrast to binary operations, which use two operands.² 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.

Printed 2026-06-28.

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Footnotes

1. Weisstein, Eric W. “Unary Operation”. mathworld.wolfram.com. Retrieved 2020-07-29. ↩

2. Weisstein, Eric W. “Binary Operation”. mathworld.wolfram.com. Retrieved 2020-07-29. ↩

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