I didn't feel like signing up for a Blogger account, but I still wanted to drop this here:
> My friend, Ray Sidney, with a PhD in mathematics from MIT explained away this nonsense rather succinctly.
> infinity + 7 = infinity
> If you minus infinity from both sides, you can tell the world 7 = 0!
http://en.wikipedia.org/wiki/Riemann_sphere#Arithmetic_opera...
infinity - infinity (along with a few others) is very often left undefined for this very reason--not to mention it lets you divide by zero without breaking math.