- #1
AxiomOfChoice
- 533
- 1
I should know how to do this, but I just can't figure it out. Should be a piece of cake. How do you prove, for [itex]x,y\in \mathbb{R}^n[/itex]:
[tex]
\left| (||x|| - ||y||) \right| \leq ||x-y||
[/tex]
[tex]
\left| (||x|| - ||y||) \right| \leq ||x-y||
[/tex]