User:Fropuff/Spheres

The articles on spheres need some reworking/reorganization. Here is what I propose.

Main articles

 * sphere (with redirects from 2-sphere, and unit sphere) - This article should concentrate on the ordinary 2-dimensional sphere in Euclidean 3-space.
 * n-sphere (with a redirect from hypersphere) - This article should treat the general case with sections on geometry and topology.

Specific spheres

 * 0-sphere
 * 1-sphere &rarr; circle
 * unit circle
 * circle group
 * 2-sphere &rarr; sphere
 * Riemann sphere
 * 3-sphere
 * 3-sphere group
 * 4-sphere
 * 5-sphere
 * 6-sphere
 * 7-sphere
 * 8-sphere

Algebraic structure

 * circle group (with redirects from U(1), SO(2) and Spin(2))
 * 3-sphere group (with redirects from SU(2), Sp(1), Spin(3), and unit quaternion group)

Topology of spheres

 * Homology sphere
 * Poincaré sphere
 * Homotopy sphere
 * Homotopy groups of spheres
 * Alexander horned sphere
 * Exotic sphere