Hello all,

I am looking at a supspace of . Given i put:

,

I would like to show that .

My thought-process: I know that signifies a ball centered at and radius . This sets our limit, i.e. may not exceed this limit. So what I basically think is that, if I can show that ( ) then I would have shown that (is my understanding correct?). I have tried this but my attempt was not succesful.

Assistance would be great.

Thanks.