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.

CEMAT - Center for Computational and Stochastic Mathematics