# Detect Zero Vector

What is the most efficient or elegant way to detect zero vector of n dimensions (list whose element are all 0)?

Answer: probably compute the sum of squares.
e.g.
`(Total[#^2] == 0 &)`

For example, here's a function for geometric inversion.

geoInv = ((With[{x = Total[#^2]}, If[ x < 0.00000001 ,#,#/x] ]) &);