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Boundary value problems for integrable nonlinear partial differentialequations are considered from the symmetry point of view. Families of boundaryconditions compatible with the Harry-Dym, KdV and MKdV equations and theVolterra chain are discussed. We also discuss the uniqueness of some of theseboundary conditions.Comment: 25 pages , Latex , no figure

Boundary value problems for integrable equations compatible with the symmetry algebra