Spherical 3-manifold
(重定向自Spherical space form)
In mathematics, a spherical 3-manifold M is a 3-manifold of the form
where is a finite subgroup of SO(4) acting freely by rotations on the 3-sphere
. All such manifolds are prime, orientable, and closed. Spherical 3-manifolds are sometimes called elliptic 3-manifolds or Clifford-Klein manifolds.