This is very OT.

I direct you to the FAQ for sci.math. 0.9999... is 1.

The long and the short of it is that our decimal system is just a representation of an underlying number system. In the underlying system, if two numbers differ by 0, then they are the same point. It is just an artifact of our representation that we happen to have 2 ways to represent 1 and only one way to represent pi.