Objects from the Class
Objects can be created by calls of the form new("SphericalSymmetry").
  More frequently they are created via the generating function 
  SphericalSymmetry. Spherical symmetry for instance leads to 
  a simplification for the computation of optimally robust influence curves.Extends
Class "EllipticalSymmetry", directly.
Class "DistributionSymmetry", by class "EllipticalSymmetry".
Class "Symmetry", by class "EllipticalSymmetry".concept
spherical symmetry