Mu badness

Mu is a function for equal tuning badness provided by Vector Graphics.

It is defined as:

[math]\displaystyle{ \mu\left(x\right)=\sum_{k=1}^{\infty}f\left(x,k\right) }[/math]

where

[math]\displaystyle{ f\left(x,k\right)=\frac{\operatorname{abs}\left(\operatorname{mod}\left(2g\left(k\right)x,2\right)-1\right)}{k^{2}} }[/math]

WIP