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fold sphere
Hubble sphere
(cosmology) Hubble volume
Klerksdorp sphere
A small object, often spherical to disc-shaped, found in three-billion-year-old pyrophyllite deposits mined near Ottosdal in South Africa.
sphere packings
plural of sphere packing
sublunary sphere
(cosmology) In geocentric cosmologies, that region of the cosmos from the centre of the Earth to the moon, believed to comprise the four classical elements (earth, air, fire and water) and to be subject to generation and corruption.
exotic sphere
A manifold (of any dimension) homeomorphic to a sphere but not diffeomorphic to the standard sphere.
unit sphere
(mathematics) A sphere with a radius of 1 unit.
sphere packing
(mathematics) The arranging of non-overlapping spheres in space
Riemann sphere
(topology, complex analysis) 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.
