The story
Named after German mathematician Bernhard Riemann.
Etymology from Wiktionary, CC BY-SA 4.0.
Riemann sphere
Today it means: The complex numbers extended with the number ∞; the complex plane (representation of the complex numbers as a Euclidean plane) extended with a single idealised point at infinity and consequently homeomorphic to a sphere in 3-dimensional Euclidean space. Full definition →