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リーマン球面
Wikipedia definition
1. Riemann sphere​In mathematics, the Riemann sphere (or extended complex plane), named after the 19th century mathematician Bernhard Riemann, is the sphere obtained from the complex plane by adding a point at infinity. The sphere is the geometric representation of the extended complex numbers C ∪ {∞}, which consist of the complex numbers together with a symbol ∞ to represent infinity.
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