Definition:Operation/Unary Operation

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A unary operation is the special case of an operation where the operation has exactly one operand.

Thus, a unary operation on a set $S$ is a mapping whose domain and codomain are both $S$.


Square Root

An example of a unary operation from algebra is $\sqrt{}$ (that is, the square root sign).

All Mappings are Unary

To a set theorist, all mappings are unary operations.

Also known as

A unary operation is also known as a unary operator.

Also see

  • Results about unary operations can be found here.

Linguistic Note

The word unary is pronounced yoo-nary.

Hence when the indefinite article precedes it, the form is (for example) a unary operation.