Definition:Euler Phi Function/Also known as

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Euler Phi Function: Also known as

The Euler $\phi$ function is also known as:

the totient function
the Euler totient function.

It is also variously rendered:

with a hyphen: Euler $\phi$-function
in the possessive form: Euler's $\phi$ function
merely as Euler's function
the $\phi$ function

The symbol $\map \varphi n$ can sometimes be seen.

Some sources use the term indicator function, but this has more than one use, and so is discouraged on $\mathsf{Pr} \infty \mathsf{fWiki}$.