A note on Breda-Robertson's conjecture
Avelino, Catarina P.; Santos, Altino F.
Journal of Pure and Applied Mathematics: Advances and Applications , 7(2) (2012), 73-82
The continuous deformation of any spherical isometric folding into the standard spherical folding, fs, defined by fs (x, y, z) = (x, y, z ), remains an open problem since 1989. We show that this conjecture is restricted to the class of primitive foldings and it is exhibited a spherical folding within this class,
where the difficulty of deformation is evidenced.