Extended complex plane
In mathematics, the Riemann sphere of complex analysis is a compact Riemann surface, which consists of a complex plane and a point at infinity.
It can be represented by an atlas with two charts, and a transition function z=1/w where w and z are nonzero. Topologically, it is just a sphere.
The Riemann sphere can be conformally mapped onto a euclidian plane by stereographic projection.
See also:
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