Thread: Unique numbers and Infinity View Single Post
 Recognitions: Homework Help Science Advisor Positive infinity is not a unique number. At least not with any reasonable meaning for number, infinity is not a number: it is not a nautural, raitonal, real or complex number. The symbols for positive and negative infinity are useful symbols but don't mean any particular number, and indeed if one looks at the one point compactification of the real line (as a sub-space of the Riemann Sphere) they are the same point.