  The global symmetry transformations generated by Runge-Lenz vector of
twodimensional Kepler problem are explicitly described. They are given in terms
of SU(2) left group multiplication with group elements being suitably
parametrized by phase space points. The resulting non-linear action of SU(2) on
the phase space is characterized in terms of the theory of nonlinear
realizations developed in Phys. Rev. 177 (1969) 2239.
