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Riemann sphere is the one point compactification of the complex plane, it can be constructed via stereographic projection of the complex plane onto the unit sphere.  The Riemann sphere is an example of a Riemann surface.

Riemann sphere is the one point compactification of the complex plane, it can be constructed via stereographic projection of the complex plane onto the unit sphere.  The Riemann sphere is an example of a Riemann surface.