@Jpsy,

The convergence of geometric series, that is

Limit as n-> infinity of the sum of 1/k^n = 1/[1-(1/k)] where |k|>1, is a righteous proof!

I first heard of it as the limit of Zeno, but later heard it as "How many angels can dance on the head of a pin?" I remember when and where I first got the logic.

Rap