Sorry about the misunderstanding of the "r" notation in my previous post.
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Originally Posted by Slavakion
I think that inifinity minus any non-infinite number is still infinity. Especially one, since one is so... oneish.
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I think what's basically going on here is that .9r is essentially equivalent to 1. It's as close to one as you can possible get, without actually being one. In calculus, if I'm not mistaken, it would be a number whose limit is one. That number, mathematically, is treated as a one because we don't have an adequate way of dealing with infinite numbers. At least, not in the way it's being used here.
By the way, I've only taken precalculus, so we haven't really gotten in to limits. If I'm off base about how this works, please correct me.