We found a nonlinear integrable system dual to the Rosochatius dynamical sy
stem in arbitrary dimensions by means of the Gauss-Knorrer map. The relatio
nship between the Rosochatius system and its dual system is elucidated from
the point of view of constrained Hamilonian systems. Dirac brackets for dy
namical variables and conserved quantities for the dual system are derived
explicitly. (C) 1999 Elsevier Science B.V.