Is the absolute value function a metric? I was trying to find out more information about absolute value, and I came upon the fact that AV satisfies a whole set of properties that usually defines a distance function or metric. But in the Wikipedia article on metrics, there's no mention of the AV function, so I'm a bit confused now. Is it some sort of metric subspace instead?
P.S.: I'm not at all well-versed on metrics, so I'd appreciate simple answers :)

Yes, for $\Bbb R$ (or $\Bbb C$ for that matter), the map $d(x,y):=|x-y|$ is a metric. 
