Function: moebius
Section: number_theoretical
C-Name: gmoebius
Prototype: G
Help: moebius(x): Moebius function of x.
Description:
 (int):small      moebius($1)
 (gen):gen        gmoebius($1)
Doc: \idx{Moebius} $\mu$-function of $|x|$. $x$ must be of type integer.
 The function accepts vector/matrices arguments, and is then applied
 componentwise.
Variant: For a \typ{INT} $x$, the variant
 \fun{long}{moebius}{GEN n} is generally easier to use.

