In complex analysis the symbol ∞{\displaystyle \infty }, called "infinity", denotes an unsigned infinite limit. x→∞{\displaystyle x\rightarrow \infty } means that the magnitude x{\displaystyle x} of x grows beyond any assigned value. A point labeled ∞{\displaystyle \infty } can be added to the complex plane as a topological space giving the onepoint compactification of the complex plane. When this is done, the resulting space is a onedimensional complex manifold, or Riemann surface, called the extended complex plane or the Riemann sphere. Arithmetic operations similar to those given above for the extended real numbers can also be defined, though there is no distinction in the signs (therefore one exception is that infinity cannot be added to itself). On the other hand, this kind of infinity enables division by zero, namely z/0=∞{\displaystyle z/0=\infty } for any nonzero complex number z. In this context it is often useful to consider meromorphic functions as maps into the Riemann sphere taking the value of ∞{\displaystyle \infty } at the poles. The domain of a complexvalued function may be extended to include the point at infinity as well. One important example of such functions is the group of Möbius transformations.
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