represents an -D Hypersphere as a quadratic hypersurface in an -D real projective space
, where are homogeneous coordinates in . Then the Group of projective
transformations which leave invariant is called the Möbius group.
Iyanaga, S. and Kawada, Y. (Eds.). ``Möbius Geometry.'' §78A in
Encyclopedic Dictionary of Mathematics. Cambridge, MA: MIT Press, pp. 265-266, 1980.
© 1996-9 Eric W. Weisstein