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Sphere
A sphere (from Greek σφαῖρα — sphaira, "globe, ball") is a perfectly round geometrical object in three-dimensional space, such as the shape of a round ball.
More at Wikipedia
3-sphere
Affine sphere
More related topics
Alexander horned sphere
Ball (mathematics)
Banach–Tarski paradox
Cube
Homogeneous spaces
Elementary geometry
Surfaces
Differential topology
Topology
Differential geometry
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