I have the problem:

Prove:

And I know I'm suppose to use the triangle inequality and the fact:

and

I tried starting with:

But I don't know how to break this up using the triangle inequality:

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- September 29th 2009, 02:07 PMeXistProof using Triangle inequality
I have the problem:

Prove:

And I know I'm suppose to use the triangle inequality and the fact:

and

I tried starting with:

But I don't know how to break this up using the triangle inequality:

- September 29th 2009, 02:22 PMPlato

Likewise:

Recall that

So putting the first two together we get.

. - September 29th 2009, 03:03 PMeXist
I'm so upset with myself. I honestly tried that but never thought of moving to the LHS. :/........

Thanks so much :D. You're my hero.