Quote by JasonRox
Ok, you came close! I totally forgot to write what S_j. I didn't know the LaTeX for it.
Here is the equation (which I'll edit in my last post):
[tex]1 = \sum_j \frac{1}{i_j}[/tex]

Ah, that makes more sense! I should have figure that S_j was meant to be summation.
I know G is the largest it can ever be. That's just stating the obvious. But I don't see how there will always be an i_j = G. In my opinion, if there is an i_j = G, then G is centerless.

That's absolutely right.