Symmetry And Perturbation Theory: Spt 98

The second workshop on “Symmetry and Perturbation Theory” served as a forum for discussing the relations between symmetry and perturbation theory, and this put in contact rather different communities. The extension of the rigorous results of perturbation theory established for ODE''s to the case of nonlinear evolution PDE''s was also discussed: here a number of results are known, particularly in c...