The book is devoted to partial differential equations of
Hamiltonian form, close to integrable equations. For such equations
a KAM-like theorem is proved, stating that solutions of the
unperturbed equation that are quasiperiodic in time mostly persist
in the perturbed one. The theorem is applied to classical nonlinear
PDE's with one-dimensional space variable such as the nonlinear
string and nonlinear Schr-dinger equation andshow that the
equations have "regular" (=time-quasiperiodic and time-periodic)
solutions in rich supply. These results cannot be obtained by other
techniques. The book will thus be of interest to mathematicians and
physicists working with nonlinear PDE's. An extensivesummary of the
results and of related topics is provided in the Introduction. All
the nontraditional material used is discussed in the firstpart of
the book and in five appendices.
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