| Аннотація | The demands of modern science inexorably force the mathematician i explore the nonlinear world. That it is a difficult and often humbling journt with painfully crude maps and rather primitive direction-finders cannot h gainsaid, but in return it can be asserted that it is richly rewarding. The fe areas that have been so far examined with any care have been full of surprisi and vastly stimulating to the imagination. There is every reason to belie\ from what so far has been glimpsed that many more surprises lay in store, nov phenomena which will open up undreamt of vistas for mathematics. It is a exciting prospect in an exciting field in an exciting time. |