In previous papers, 15 families of minimal balance surfaces that can be generated with the aid of disc-like surface patches were noted. Recently, it has become apparent that the inherent symmetry of two of these families, the C(S) surfaces and the Y surfaces, is higher than the symmetry used for their generation. As a consequence, C(S) surfaces are in fact P surfaces and Y surfaces are in fact D surfaces.
Aarya PatelFalak PatelVishvesh Badheka
Hermann KarcherKonrad Polthier